diff --git a/vllm/model_executor/models/AXK1.py b/vllm/model_executor/models/AXK1.py
index 3084506282a..dbccc1f80ba 100644
--- a/vllm/model_executor/models/AXK1.py
+++ b/vllm/model_executor/models/AXK1.py
@@ -1096,7 +1096,7 @@ class AXK1ForCausalLM(
         else:
             self.lm_head = PPMissingLayer()
         self.logits_processor = LogitsProcessor(config.vocab_size)
-        self.make_empty_intermediate_tensors = (  # type: ignore[method-assign]
+        self.make_empty_intermediate_tensors = (
             self.model.make_empty_intermediate_tensors
         )
         # Set MoE hyperparameters
diff --git a/vllm/model_executor/models/adapters.py b/vllm/model_executor/models/adapters.py
index 676f6096ad8..20913b671a7 100644
--- a/vllm/model_executor/models/adapters.py
+++ b/vllm/model_executor/models/adapters.py
@@ -25,7 +25,7 @@ if TYPE_CHECKING:
     from vllm.config import ModelConfig, VllmConfig
     from vllm.model_executor.layers.pooler import Pooler
 
-_T = TypeVar("_T", bound=type[nn.Module])
+_T = TypeVar("_T", bound=nn.Module)
 
 logger = init_logger(__name__)
 
@@ -126,7 +126,7 @@ def _get_pooling_model_name(orig_model_name: str, pooling_suffix: str) -> str:
     return model_name + pooling_suffix
 
 
-def _create_pooling_model_cls(orig_cls: _T) -> _T:
+def _create_pooling_model_cls(orig_cls: type[_T]) -> type[_T]:
     # Lazy import
     from vllm.model_executor.layers.logits_processor import LogitsProcessor
     from vllm.model_executor.layers.vocab_parallel_embedding import ParallelLMHead
@@ -157,9 +157,10 @@ def _create_pooling_model_cls(orig_cls: _T) -> _T:
 
             # If the model already defines a pooler instance, don't overwrite it
             pooler = getattr(self, "pooler", None)
-            if not pooler and supports_multimodal(self):
+            multimodal_model: object = self
+            if not pooler and supports_multimodal(multimodal_model):
                 # Try to get the pooler from the LM backbone
-                language_model = self.get_language_model()  # type: ignore[call-arg]
+                language_model = multimodal_model.get_language_model()
                 if hasattr(language_model, "pooler"):
                     pooler = language_model.pooler
 
@@ -175,7 +176,9 @@ def _create_pooling_model_cls(orig_cls: _T) -> _T:
         ) -> "Pooler":
             raise NotImplementedError
 
-        def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]):
+        def _load_pooling_model_weights(
+            self, weights: Iterable[tuple[str, torch.Tensor]]
+        ):
             params_dict = dict(self.named_parameters())
 
             # We support loading from both `*ForCausalLM` and `*Model`
@@ -226,10 +229,13 @@ def _create_pooling_model_cls(orig_cls: _T) -> _T:
             load_weights = getattr(super(), "load_weights", default_load_weights)
             return load_weights(mapped_weights)
 
-    return ModelForPooling  # type: ignore
+        def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]):
+            return self._load_pooling_model_weights(weights)
+
+    return ModelForPooling
 
 
-def as_embedding_model(cls: _T) -> _T:
+def as_embedding_model(cls: type[_T]) -> type[_T]:
     """
     Subclass an existing vLLM model to support embeddings.
 
@@ -260,10 +266,10 @@ def as_embedding_model(cls: _T) -> _T:
 
     ModelForEmbedding.__name__ = _get_pooling_model_name(cls.__name__, "ForEmbedding")
 
-    return ModelForEmbedding  # type: ignore
+    return ModelForEmbedding
 
 
-def as_seq_cls_model(cls: _T) -> _T:
+def as_seq_cls_model(cls: type[_T]) -> type[_T]:
     """
     Subclass an existing vLLM model to support classify and score tasks.
 
@@ -369,7 +375,7 @@ def as_seq_cls_model(cls: _T) -> _T:
         cls.__name__, "ForSequenceClassification"
     )
 
-    return ModelForSequenceClassification  # type: ignore
+    return ModelForSequenceClassification
 
 
 class SequenceClassificationConfig(VerifyAndUpdateConfig):
@@ -403,14 +409,15 @@ class SequenceClassificationConfig(VerifyAndUpdateConfig):
         text_config.use_sep_token = use_sep_token
 
 
-def _get_language_model_for_seq_cls(model) -> nn.Module:
+def _get_language_model_for_seq_cls(model: nn.Module) -> nn.Module:
     """
     Get the language model component for sequence classification conversion.
     For VLMs, returns the inner language model. For standard LLMs, returns model itself.
     """
-    if supports_multimodal(model):
+    multimodal_model: object = model
+    if supports_multimodal(multimodal_model):
         try:
-            lm = model.get_language_model()  # type: ignore[call-arg]
+            lm = multimodal_model.get_language_model()
             if lm is not model:
                 return lm
         except Exception:
@@ -512,14 +519,7 @@ def load_weights_using_from_2_way_softmax(
         language_model.lm_head = language_model.lm_head.tie_weights(embed_tokens)
 
     with _disable_seq_cls_loading_on_inner_model(language_model, is_vlm):
-        # ModelForPooling is dynamically defined inside the _create_pooling_model_cls
-        # function, so we need use this hacky method to obtain it.
-        pooling_model_cls = next(
-            x for x in type(model).__mro__ if x.__name__ == "ModelForPooling"
-        )
-        loaded_weights = pooling_model_cls.load_weights(  # type: ignore[attr-defined]
-            model, weights
-        )
+        loaded_weights = model._load_pooling_model_weights(weights)
 
     from vllm.tokenizers import get_tokenizer
 
@@ -587,13 +587,8 @@ def load_weights_no_post_processing(model, weights: Iterable[tuple[str, torch.Te
         language_model.lm_head = language_model.lm_head.tie_weights(embed_tokens)
 
     with _disable_seq_cls_loading_on_inner_model(language_model, is_vlm):
-        pooling_model_cls = next(
-            x for x in type(model).__mro__ if x.__name__ == "ModelForPooling"
-        )
-        # Skip ModelForSequenceClassification in MRO to avoid infinite recursion
-        loaded_weights = pooling_model_cls.load_weights(  # type: ignore[attr-defined]
-            model, weights
-        )
+        # Bypass ModelForSequenceClassification to avoid infinite recursion
+        loaded_weights = model._load_pooling_model_weights(weights)
 
     from vllm.tokenizers import get_tokenizer
 
diff --git a/vllm/model_executor/models/afmoe.py b/vllm/model_executor/models/afmoe.py
index f456229b2f7..aefdf082869 100644
--- a/vllm/model_executor/models/afmoe.py
+++ b/vllm/model_executor/models/afmoe.py
@@ -47,7 +47,6 @@ from vllm.model_executor.models.utils import (
     PPMissingLayer,
     WeightsMapper,
     extract_layer_index,
-    make_empty_intermediate_tensors_factory,
     make_layers,
     maybe_prefix,
 )
@@ -409,12 +408,6 @@ class AfmoeModel(nn.Module, EagleModelMixin):
         else:
             self.norm = PPMissingLayer()
 
-        self.make_empty_intermediate_tensors = (  # type: ignore[method-assign]
-            make_empty_intermediate_tensors_factory(
-                ["hidden_states", "residual"], config.hidden_size
-            )
-        )
-
     def embed_input_ids(self, input_ids: torch.Tensor) -> torch.Tensor:
         return self.embed_tokens(input_ids)
 
@@ -527,7 +520,7 @@ class AfmoeForCausalLM(
         else:
             self.lm_head = PPMissingLayer()
         self.logits_processor = LogitsProcessor(config.vocab_size)
-        self.make_empty_intermediate_tensors = (  # type: ignore[method-assign]
+        self.make_empty_intermediate_tensors = (
             self.model.make_empty_intermediate_tensors
         )
         # Set MoE hyperparameters
@@ -578,7 +571,7 @@ class AfmoeForCausalLM(
     def embed_input_ids(self, input_ids: torch.Tensor) -> torch.Tensor:
         return self.model.embed_input_ids(input_ids)
 
-    def forward(  # type: ignore[override]
+    def forward(
         self,
         input_ids: torch.Tensor | None,
         positions: torch.Tensor,
diff --git a/vllm/model_executor/models/apertus.py b/vllm/model_executor/models/apertus.py
index ffda816bb47..b997e153a99 100644
--- a/vllm/model_executor/models/apertus.py
+++ b/vllm/model_executor/models/apertus.py
@@ -454,7 +454,7 @@ class ApertusForCausalLM(
         else:
             self.lm_head = PPMissingLayer()
 
-        self.make_empty_intermediate_tensors = (  # type: ignore[method-assign]
+        self.make_empty_intermediate_tensors = (
             self.model.make_empty_intermediate_tensors
         )
 
diff --git a/vllm/model_executor/models/arcee.py b/vllm/model_executor/models/arcee.py
index 185509eb7bc..c32a903bba8 100644
--- a/vllm/model_executor/models/arcee.py
+++ b/vllm/model_executor/models/arcee.py
@@ -326,7 +326,7 @@ class ArceeForCausalLM(
             # Placeholder for lm_head on non-last ranks
             self.lm_head = PPMissingLayer()
 
-        self.make_empty_intermediate_tensors = (  # type: ignore[method-assign]
+        self.make_empty_intermediate_tensors = (
             self.model.make_empty_intermediate_tensors
         )
 
diff --git a/vllm/model_executor/models/arctic.py b/vllm/model_executor/models/arctic.py
index 3922c1025a4..b7e8e6796f3 100644
--- a/vllm/model_executor/models/arctic.py
+++ b/vllm/model_executor/models/arctic.py
@@ -562,7 +562,7 @@ class ArcticForCausalLM(nn.Module, SupportsPP, SupportsQuant):
         self.num_experts_per_tok = config.num_experts_per_tok
 
         self.logits_processor = LogitsProcessor(config.vocab_size)
-        self.make_empty_intermediate_tensors = (  # type: ignore[method-assign]
+        self.make_empty_intermediate_tensors = (
             self.model.make_empty_intermediate_tensors
         )
 
diff --git a/vllm/model_executor/models/audioflamingo3.py b/vllm/model_executor/models/audioflamingo3.py
index 5a471bfaf4c..e64d9e551b1 100644
--- a/vllm/model_executor/models/audioflamingo3.py
+++ b/vllm/model_executor/models/audioflamingo3.py
@@ -17,7 +17,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from collections.abc import Iterable, Mapping, Sequence
+from collections.abc import Iterable, Mapping, Sequence, Sized
 from typing import Annotated, Any, Literal, TypeAlias
 
 import torch
@@ -30,7 +30,7 @@ from transformers.models.audioflamingo3 import (
 from transformers.models.qwen2_audio import Qwen2AudioEncoder
 
 from vllm.config import VllmConfig
-from vllm.config.multimodal import BaseDummyOptions
+from vllm.config.multimodal import AudioDummyOptions, BaseDummyOptions
 from vllm.inputs import ModalityData, MultiModalDataDict
 from vllm.model_executor.layers.activation import get_act_fn
 from vllm.model_executor.models.module_mapping import MultiModelKeys
@@ -226,12 +226,13 @@ class AudioFlamingo3DummyInputsBuilder(
         audio_len = int(hf_processor.max_audio_len * sampling_rate)
         num_audios = mm_counts.get("audio", 0)
         audio_overrides = mm_options.get("audio")
+        assert audio_overrides is None or isinstance(audio_overrides, AudioDummyOptions)
 
         return {
             "audio": self._get_dummy_audios(
                 length=audio_len,
                 num_audios=num_audios,
-                overrides=audio_overrides,  # type: ignore[arg-type]
+                overrides=audio_overrides,
             )
         }
 
@@ -412,7 +413,8 @@ class AudioFlamingo3MultiModalProcessor(
         chunk_counts = []
         for audio in audio_list:
             # audio is numpy array or list
-            n_samples = len(audio)  # type: ignore[arg-type]
+            assert isinstance(audio, Sized)
+            n_samples = len(audio)
 
             n_win = max(1, (n_samples + window_size - 1) // window_size)
             if n_win > max_windows:
@@ -524,7 +526,7 @@ class AudioFlamingo3ForConditionalGeneration(
                 architectures=["Qwen2ForCausalLM"],
             )
 
-        self.make_empty_intermediate_tensors = (  # type: ignore[method-assign]
+        self.make_empty_intermediate_tensors = (
             self.language_model.make_empty_intermediate_tensors
         )
 
@@ -557,17 +559,15 @@ class AudioFlamingo3ForConditionalGeneration(
     def _process_audio_input(
         self, audio_input: AudioFlamingo3Inputs
     ) -> torch.Tensor | tuple[torch.Tensor, ...]:
-        if audio_input["type"] == "audio_embeds":
-            audio_embeds = audio_input["audio_embeds"]
+        if audio_input.type == "audio_embeds":
+            audio_embeds = audio_input.audio_embeds
             return tuple(audio_embeds)
 
         (
             input_features,
             feature_attention_mask,
             chunk_counts,
-        ) = self._normalize_audio_feature_inputs(
-            audio_input  # type: ignore[arg-type]
-        )
+        ) = self._normalize_audio_feature_inputs(audio_input)
         audio_hidden_states = self._encode_audio_features(
             input_features,
             feature_attention_mask,
diff --git a/vllm/model_executor/models/bagel.py b/vllm/model_executor/models/bagel.py
index fc18751ec86..e592dd3728c 100644
--- a/vllm/model_executor/models/bagel.py
+++ b/vllm/model_executor/models/bagel.py
@@ -14,7 +14,7 @@ import torch
 import torch.nn as nn
 
 from vllm.config import VllmConfig
-from vllm.config.multimodal import BaseDummyOptions
+from vllm.config.multimodal import BaseDummyOptions, ImageDummyOptions
 from vllm.inputs import MultiModalDataDict
 from vllm.logger import init_logger
 from vllm.model_executor.layers.activation import get_act_fn
@@ -258,13 +258,14 @@ class BagelDummyInputsBuilder(BaseDummyInputsBuilder[BagelProcessingInfo]):
         # Use the configured image size
         image_size = vit_config.image_size
         image_overrides = mm_options.get("image")
+        assert image_overrides is None or isinstance(image_overrides, ImageDummyOptions)
 
         return {
             "image": self._get_dummy_images(
                 width=image_size,
                 height=image_size,
                 num_images=num_images,
-                overrides=image_overrides,  # type: ignore[arg-type]
+                overrides=image_overrides,
             ),
         }
 
@@ -430,7 +431,7 @@ class BagelForConditionalGeneration(
             self.connector = StageMissingLayer("image_tower")
             self.vit_pos_embed = StageMissingLayer("image_tower")
 
-        self.make_empty_intermediate_tensors = (  # type: ignore[method-assign]
+        self.make_empty_intermediate_tensors = (
             self.language_model.make_empty_intermediate_tensors
         )
 
diff --git a/vllm/model_executor/models/bailing_moe.py b/vllm/model_executor/models/bailing_moe.py
index a5d583f1256..c2ba3c33883 100644
--- a/vllm/model_executor/models/bailing_moe.py
+++ b/vllm/model_executor/models/bailing_moe.py
@@ -522,7 +522,7 @@ class BailingMoeForCausalLM(nn.Module, SupportsPP, SupportsLoRA):
         else:
             self.lm_head = PPMissingLayer()
 
-        self.make_empty_intermediate_tensors = (  # type: ignore[method-assign]
+        self.make_empty_intermediate_tensors = (
             self.model.make_empty_intermediate_tensors
         )
 
diff --git a/vllm/model_executor/models/bailing_moe_linear.py b/vllm/model_executor/models/bailing_moe_linear.py
index c7658294e81..36e91129bae 100644
--- a/vllm/model_executor/models/bailing_moe_linear.py
+++ b/vllm/model_executor/models/bailing_moe_linear.py
@@ -790,7 +790,7 @@ class BailingMoeV25ForCausalLM(nn.Module, HasInnerState, IsHybrid, SupportsPP):
         )
 
     @classmethod
-    def get_mamba_state_shape_from_config(  # type: ignore[override]
+    def get_mamba_state_shape_from_config(
         cls,
         vllm_config: VllmConfig,
     ) -> tuple[tuple[int, ...], ...]:
diff --git a/vllm/model_executor/models/bee.py b/vllm/model_executor/models/bee.py
index 06e90d486d1..4a57413b6e8 100644
--- a/vllm/model_executor/models/bee.py
+++ b/vllm/model_executor/models/bee.py
@@ -8,7 +8,7 @@ import torch.nn as nn
 from transformers.activations import GELUActivation
 
 from vllm.config import VllmConfig
-from vllm.config.multimodal import BaseDummyOptions
+from vllm.config.multimodal import BaseDummyOptions, ImageDummyOptions
 from vllm.inputs import MultiModalDataDict
 from vllm.multimodal import MULTIMODAL_REGISTRY
 
@@ -97,13 +97,14 @@ class BeeDummyInputsBuilder(LlavaDummyInputsBuilder[BeeProcessingInfo]):
         target_width, target_height = self.info.get_image_size_with_most_features()
 
         image_overrides = mm_options.get("image")
+        assert image_overrides is None or isinstance(image_overrides, ImageDummyOptions)
 
         return {
             "image": self._get_dummy_images(
                 width=target_width,
                 height=target_height,
                 num_images=num_images,
-                overrides=image_overrides,  # type: ignore[arg-type]
+                overrides=image_overrides,
             ),
         }
 
@@ -133,7 +134,7 @@ class BeeMultiModalProjector(nn.Module):
         return hidden_states
 
 
-@MULTIMODAL_REGISTRY.register_processor(  # type: ignore[misc]
+@MULTIMODAL_REGISTRY.register_processor(
     LlavaNextMultiModalProcessor,
     info=BeeProcessingInfo,
     dummy_inputs=BeeDummyInputsBuilder,
diff --git a/vllm/model_executor/models/blip2.py b/vllm/model_executor/models/blip2.py
index b14c73f4d16..baa1a16a59b 100644
--- a/vllm/model_executor/models/blip2.py
+++ b/vllm/model_executor/models/blip2.py
@@ -14,7 +14,7 @@ from transformers import (
 )
 
 from vllm.config import CacheConfig, VllmConfig
-from vllm.config.multimodal import BaseDummyOptions
+from vllm.config.multimodal import BaseDummyOptions, ImageDummyOptions
 from vllm.inputs import MultiModalDataDict
 from vllm.model_executor.layers.activation import get_act_fn
 from vllm.model_executor.layers.quantization import QuantizationConfig
@@ -454,13 +454,14 @@ class Blip2DummyInputsBuilder(BaseDummyInputsBuilder[Blip2ProcessingInfo]):
         num_images = mm_counts.get("image", 0)
 
         image_overrides = mm_options.get("image")
+        assert image_overrides is None or isinstance(image_overrides, ImageDummyOptions)
 
         return {
             "image": self._get_dummy_images(
                 width=max_image_size,
                 height=max_image_size,
                 num_images=num_images,
-                overrides=image_overrides,  # type: ignore[arg-type]
+                overrides=image_overrides,
             )
         }
 
@@ -523,7 +524,7 @@ class Blip2MultiModalProcessor(BaseMultiModalProcessor[Blip2ProcessingInfo]):
     info=Blip2ProcessingInfo,
     dummy_inputs=Blip2DummyInputsBuilder,
 )
-class Blip2ForConditionalGeneration(  # type: ignore[misc]
+class Blip2ForConditionalGeneration(
     nn.Module, SupportsLoRA, SupportsMultiModal, SupportsPP, SupportsQuant
 ):
     @classmethod
@@ -576,7 +577,7 @@ class Blip2ForConditionalGeneration(  # type: ignore[misc]
                 prefix=maybe_prefix(prefix, "language_model"),
             )
 
-        self.make_empty_intermediate_tensors = (  # type: ignore[method-assign]
+        self.make_empty_intermediate_tensors = (
             self.language_model.make_empty_intermediate_tensors
         )
 
@@ -620,10 +621,10 @@ class Blip2ForConditionalGeneration(  # type: ignore[misc]
         return self._image_pixels_to_features(self.vision_model, pixel_values)
 
     def _process_image_input(self, image_input: Blip2ImageInputs) -> torch.Tensor:
-        if image_input["type"] == "image_embeds":
-            return image_input["data"]
+        if image_input.type == "image_embeds":
+            return image_input.data
 
-        image_features = self._process_image_pixels(image_input)  # type: ignore[arg-type]
+        image_features = self._process_image_pixels(image_input)
 
         query_tokens = self.query_tokens.expand(image_features.shape[0], -1, -1)
         query_output = self.qformer(
diff --git a/vllm/model_executor/models/bloom.py b/vllm/model_executor/models/bloom.py
index 0b0750bd52b..cdcf82f385f 100644
--- a/vllm/model_executor/models/bloom.py
+++ b/vllm/model_executor/models/bloom.py
@@ -334,7 +334,7 @@ class BloomForCausalLM(nn.Module, SupportsPP, SupportsQuant):
             )
 
         self.logits_processor = LogitsProcessor(config.vocab_size)
-        self.make_empty_intermediate_tensors = (  # type: ignore[method-assign]
+        self.make_empty_intermediate_tensors = (
             self.transformer.make_empty_intermediate_tensors
         )
 
diff --git a/vllm/model_executor/models/interfaces.py b/vllm/model_executor/models/interfaces.py
index 32534f8fbb7..da16f3031a6 100644
--- a/vllm/model_executor/models/interfaces.py
+++ b/vllm/model_executor/models/interfaces.py
@@ -558,7 +558,7 @@ class SupportsLoRA(Protocol):
     # The `embedding_module` and `embedding_padding_modules`
     # are empty by default.
     embedding_modules: ClassVar[dict[str, str]] = {}
-    packed_modules_mapping: dict[str, list[str]] = {}
+    packed_modules_mapping: ClassVar[dict[str, list[str]]] = {}
     # Module prefixes to skip during LoRA loading (e.g., ["mtp."] for MTP layers)
     lora_skip_prefixes: ClassVar[list[str]] = []
     lora_manager: "LoRAModelManager | None"
@@ -633,14 +633,10 @@ class SupportsPP(Protocol):
         MRO of your model class.
     """
 
-    def make_empty_intermediate_tensors(
-        self,
-        batch_size: int,
-        dtype: torch.dtype,
-        device: torch.device,
-    ) -> "IntermediateTensors":
-        """Called when PP rank > 0 for profiling purposes."""
-        ...
+    make_empty_intermediate_tensors: Callable[
+        [int, torch.dtype, torch.device], "IntermediateTensors"
+    ]
+    """Called when PP rank > 0 for profiling purposes."""
 
     def forward(
         self,
@@ -648,7 +644,7 @@ class SupportsPP(Protocol):
         positions: Tensor,
         *,
         intermediate_tensors: "IntermediateTensors | None",
-    ) -> "IntermediateTensors | None":
+    ) -> "Tensor | IntermediateTensors | tuple[Tensor, list[Tensor]]":
         """
         Accept [`IntermediateTensors`][vllm.sequence.IntermediateTensors] when
         PP rank > 0.
@@ -665,12 +661,9 @@ class SupportsPP(Protocol):
 class _SupportsPPType(Protocol):
     supports_pp: Literal[True]
 
-    def make_empty_intermediate_tensors(
-        self,
-        batch_size: int,
-        dtype: torch.dtype,
-        device: torch.device,
-    ) -> "IntermediateTensors": ...
+    make_empty_intermediate_tensors: Callable[
+        [int, torch.dtype, torch.device], "IntermediateTensors"
+    ]
 
     def forward(
         self,
@@ -678,7 +671,7 @@ class _SupportsPPType(Protocol):
         positions: Tensor,
         *,
         intermediate_tensors: "IntermediateTensors | None",
-    ) -> "Tensor | IntermediateTensors": ...
+    ) -> "Tensor | IntermediateTensors | tuple[Tensor, list[Tensor]]": ...
 
 
 @overload
@@ -809,16 +802,14 @@ class IsHybrid(Protocol):
     def get_mamba_state_shape_from_config(
         cls,
         vllm_config: "VllmConfig",
-    ) -> tuple[tuple[int, int], tuple[int, int, int]]:
+    ) -> tuple[tuple[int, ...], ...]:
         """Calculate shapes for Mamba's convolutional and state caches.
 
         Args:
             vllm_config: vLLM config
 
         Returns:
-            Tuple containing:
-            - conv_state_shape: Shape for convolutional state cache
-            - temporal_state_shape: Shape for state space model cache
+            Shapes for each state cache used by the model.
         """
         ...
 
@@ -1007,7 +998,7 @@ class SupportsQuant:
     """The interface required for all models that support quantization."""
 
     hf_to_vllm_mapper: ClassVar["WeightsMapper | None"] = None
-    packed_modules_mapping: ClassVar[dict[str, list[str]] | None] = None
+    packed_modules_mapping: ClassVar[dict[str, list[str]]] = {}
     quant_config: QuantizationConfig | None = None
 
     def __new__(cls, *args, **kwargs) -> Self:
@@ -1042,8 +1033,7 @@ class SupportsQuant:
         if (hf_to_vllm_mapper := self.hf_to_vllm_mapper) is not None:
             unstacked_mapper = hf_to_vllm_mapper.get_unstacked_mapper()
             self.quant_config.apply_vllm_mapper(unstacked_mapper)
-        if self.packed_modules_mapping is not None:
-            self.quant_config.packed_modules_mapping.update(self.packed_modules_mapping)
+        self.quant_config.packed_modules_mapping.update(self.packed_modules_mapping)
 
 
 @runtime_checkable
diff --git a/vllm/model_executor/models/llava_next.py b/vllm/model_executor/models/llava_next.py
index fdd1d41af5a..44d50f434a4 100644
--- a/vllm/model_executor/models/llava_next.py
+++ b/vllm/model_executor/models/llava_next.py
@@ -204,9 +204,7 @@ class BaseLlavaNextMultiModalProcessor(BaseLlavaMultiModalProcessor[_I]):
         raise NotImplementedError
 
 
-class LlavaNextMultiModalProcessor(
-    BaseLlavaNextMultiModalProcessor[LlavaNextProcessingInfo]
-):
+class LlavaNextMultiModalProcessor(BaseLlavaNextMultiModalProcessor[_I]):
     def _get_mm_fields_config(
         self,
         hf_inputs: BatchFeature,