diff --git a/Modules/Core/ImageAdaptors/include/itkImageAdaptor.h b/Modules/Core/ImageAdaptors/include/itkImageAdaptor.h
index 37bd325028e..8e8879244c1 100644
--- a/Modules/Core/ImageAdaptors/include/itkImageAdaptor.h
+++ b/Modules/Core/ImageAdaptors/include/itkImageAdaptor.h
@@ -271,8 +271,10 @@ class ITK_TEMPLATE_EXPORT ImageAdaptor : public ImageBase<TImage::ImageDimension
   virtual void
   Graft(const Self * imgData);
 
+#ifndef ITK_FUTURE_LEGACY_REMOVE
   /** Convenient type alias. */
-  using InternalPixelPointerType = InternalPixelType *;
+  using InternalPixelPointerType [[deprecated("Please just use `InternalPixelType *` instead!")]] = InternalPixelType *;
+#endif
 
   /** Return a pointer to the beginning of the buffer.  This is used by
    * the image iterator class. */
diff --git a/Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMesh.h b/Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMesh.h
index d3e5fb6e8fc..592f607c314 100644
--- a/Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMesh.h
+++ b/Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMesh.h
@@ -152,8 +152,9 @@ class ITK_TEMPLATE_EXPORT QuadEdgeMesh : public Mesh<TPixel, VDimension, TTraits
   /** Auxiliary types. */
   using PointIdList = std::vector<PointIdentifier>;
   using EdgeListType = std::list<QEPrimal *>;
-  using EdgeListPointerType = EdgeListType *;
-
+#ifndef ITK_FUTURE_LEGACY_REMOVE
+  using EdgeListPointerType [[deprecated("Please just use `EdgeListType *` instead!")]] = EdgeListType *;
+#endif
   using MeshClassCellsAllocationMethodEnum = itk::MeshEnums::MeshClassCellsAllocationMethod;
 
   /** Reserved PointIdentifier designated to represent the absence of Point */
diff --git a/Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMeshBoundaryEdgesMeshFunction.h b/Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMeshBoundaryEdgesMeshFunction.h
index 72809b34829..49aeae3c3ff 100644
--- a/Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMeshBoundaryEdgesMeshFunction.h
+++ b/Modules/Core/QuadEdgeMesh/include/itkQuadEdgeMeshBoundaryEdgesMeshFunction.h
@@ -35,7 +35,7 @@ namespace itk
  */
 template <typename TMesh>
 class ITK_TEMPLATE_EXPORT QuadEdgeMeshBoundaryEdgesMeshFunction
-  : public FunctionBase<TMesh, typename TMesh::EdgeListPointerType>
+  : public FunctionBase<TMesh, typename TMesh::EdgeListType *>
 {
 public:
   ITK_DISALLOW_COPY_AND_MOVE(QuadEdgeMeshBoundaryEdgesMeshFunction);
@@ -44,7 +44,7 @@ class ITK_TEMPLATE_EXPORT QuadEdgeMeshBoundaryEdgesMeshFunction
   using Self = QuadEdgeMeshBoundaryEdgesMeshFunction;
   using Pointer = SmartPointer<Self>;
   using ConstPointer = SmartPointer<const Self>;
-  using Superclass = FunctionBase<TMesh, typename TMesh::EdgeListPointerType>;
+  using Superclass = FunctionBase<TMesh, typename TMesh::EdgeListType *>;
 
   // Types in superclass:
   using typename Superclass::InputType;
diff --git a/Modules/Filtering/Smoothing/include/itkDiscreteGaussianImageFilter.h b/Modules/Filtering/Smoothing/include/itkDiscreteGaussianImageFilter.h
index 30767ba890f..6268a644b6f 100644
--- a/Modules/Filtering/Smoothing/include/itkDiscreteGaussianImageFilter.h
+++ b/Modules/Filtering/Smoothing/include/itkDiscreteGaussianImageFilter.h
@@ -104,7 +104,10 @@ class ITK_TEMPLATE_EXPORT DiscreteGaussianImageFilter : public ImageToImageFilte
 
   /** Typedef to describe the boundary condition. */
   using BoundaryConditionType = ImageBoundaryCondition<TInputImage>;
-  using InputBoundaryConditionPointerType = BoundaryConditionType *;
+#ifndef ITK_FUTURE_LEGACY_REMOVE
+  using InputBoundaryConditionPointerType [[deprecated("Please just use `BoundaryConditionType *` instead!")]] =
+    BoundaryConditionType *;
+#endif
   using InputDefaultBoundaryConditionType = ZeroFluxNeumannBoundaryCondition<TInputImage>;
   using RealBoundaryConditionPointerType = ImageBoundaryCondition<RealOutputImageType> *;
   using RealDefaultBoundaryConditionType = ZeroFluxNeumannBoundaryCondition<RealOutputImageType>;
@@ -147,8 +150,8 @@ class ITK_TEMPLATE_EXPORT DiscreteGaussianImageFilter : public ImageToImageFilte
   itkSetMacro(FilterDimensionality, unsigned int);
 
   /** Set/get the boundary condition. */
-  itkSetMacro(InputBoundaryCondition, InputBoundaryConditionPointerType);
-  itkGetConstMacro(InputBoundaryCondition, InputBoundaryConditionPointerType);
+  itkSetMacro(InputBoundaryCondition, BoundaryConditionType *);
+  itkGetConstMacro(InputBoundaryCondition, BoundaryConditionType *);
   itkSetMacro(RealBoundaryCondition, RealBoundaryConditionPointerType);
   itkGetConstMacro(RealBoundaryCondition, RealBoundaryConditionPointerType);
 
@@ -387,7 +390,7 @@ class ITK_TEMPLATE_EXPORT DiscreteGaussianImageFilter : public ImageToImageFilte
 
   /** Pointer to a persistent boundary condition object used
    ** for the image iterator. */
-  InputBoundaryConditionPointerType m_InputBoundaryCondition{};
+  BoundaryConditionType * m_InputBoundaryCondition{};
 
   /** Default boundary condition */
   InputDefaultBoundaryConditionType m_InputDefaultBoundaryCondition{};
diff --git a/Modules/Filtering/Smoothing/include/itkFFTDiscreteGaussianImageFilter.h b/Modules/Filtering/Smoothing/include/itkFFTDiscreteGaussianImageFilter.h
index 8dcfd3dcc6d..0acd4f6ba21 100644
--- a/Modules/Filtering/Smoothing/include/itkFFTDiscreteGaussianImageFilter.h
+++ b/Modules/Filtering/Smoothing/include/itkFFTDiscreteGaussianImageFilter.h
@@ -124,7 +124,6 @@ class ITK_TEMPLATE_EXPORT FFTDiscreteGaussianImageFilter : public DiscreteGaussi
 
   /** Typedef to describe the boundary condition. */
   using typename Superclass::BoundaryConditionType;
-  using typename Superclass::InputBoundaryConditionPointerType;
   using typename Superclass::InputDefaultBoundaryConditionType;
   using typename Superclass::RealBoundaryConditionPointerType;
   using typename Superclass::RealDefaultBoundaryConditionType;
@@ -144,7 +143,7 @@ class ITK_TEMPLATE_EXPORT FFTDiscreteGaussianImageFilter : public DiscreteGaussi
   /** Overridden accessors for unused parameters */
 
   void
-  SetInputBoundaryCondition(const InputBoundaryConditionPointerType) override;
+  SetInputBoundaryCondition(BoundaryConditionType *) override;
 
   itkSetMacro(KernelSource, FFTDiscreteGaussianImageFilterEnums::KernelSource);
   itkGetConstMacro(KernelSource, FFTDiscreteGaussianImageFilterEnums::KernelSource);
diff --git a/Modules/Filtering/Smoothing/include/itkFFTDiscreteGaussianImageFilter.hxx b/Modules/Filtering/Smoothing/include/itkFFTDiscreteGaussianImageFilter.hxx
index be90f2bbf16..37399004984 100644
--- a/Modules/Filtering/Smoothing/include/itkFFTDiscreteGaussianImageFilter.hxx
+++ b/Modules/Filtering/Smoothing/include/itkFFTDiscreteGaussianImageFilter.hxx
@@ -67,8 +67,7 @@ FFTDiscreteGaussianImageFilter<TInputImage, TOutputImage>::GenerateInputRequeste
 
 template <typename TInputImage, typename TOutputImage>
 void
-FFTDiscreteGaussianImageFilter<TInputImage, TOutputImage>::SetInputBoundaryCondition(
-  const InputBoundaryConditionPointerType)
+FFTDiscreteGaussianImageFilter<TInputImage, TOutputImage>::SetInputBoundaryCondition(BoundaryConditionType *)
 {
   itkWarningMacro("FFTDiscreteGaussianImageFilter ignores InputBoundaryCondition, use RealBoundaryCondition instead");
 }