diff --git a/fury/actor.py b/fury/actor.py
index 346373bc9..ef5f24175 100644
--- a/fury/actor.py
+++ b/fury/actor.py
@@ -1091,8 +1091,8 @@ def odf_slicer(
         global_cm,
         colormap,
         opacity,
-        affine,
-        B_matrix,
+        affine=affine,
+        B=B_matrix,
     )
 
 
diff --git a/fury/actors/odf_slicer.py b/fury/actors/odf_slicer.py
index fefbd5abe..1fe075b44 100644
--- a/fury/actors/odf_slicer.py
+++ b/fury/actors/odf_slicer.py
@@ -2,6 +2,7 @@
 import numpy as np
 
 from fury.colormap import create_colormap
+from fury.decorators import warn_on_args_to_kwargs
 from fury.lib import Actor, PolyData, PolyDataMapper
 from fury.utils import (
     apply_affine,
@@ -51,6 +52,7 @@ class OdfSlicerActor(Actor):
 
     """
 
+    @warn_on_args_to_kwargs()
     def __init__(
         self,
         odfs,
@@ -64,6 +66,7 @@ def __init__(
         global_cm,
         colormap,
         opacity,
+        *,
         affine=None,
         B=None,
     ):
@@ -122,7 +125,8 @@ def display_extent(self, x1, x2, y1, y2, z1, z2):
 
         self._update_mapper()
 
-    def slice_along_axis(self, slice_index, axis="zaxis"):
+    @warn_on_args_to_kwargs()
+    def slice_along_axis(self, slice_index, *, axis="zaxis"):
         """Slice ODF field at given `slice_index` along axis
         in ['xaxis', 'yaxis', zaxis'].
         """
@@ -156,16 +160,17 @@ def slice_along_axis(self, slice_index, axis="zaxis"):
         else:
             raise ValueError("Invalid axis name {0}.".format(axis))
 
-    def display(self, x=None, y=None, z=None):
+    @warn_on_args_to_kwargs()
+    def display(self, *, x=None, y=None, z=None):
         """Display a slice along x, y, or z axis."""
         if x is None and y is None and z is None:
             self.slice_along_axis(self.grid_shape[2] // 2)
         elif x is not None:
-            self.slice_along_axis(x, "xaxis")
+            self.slice_along_axis(x, axis="xaxis")
         elif y is not None:
-            self.slice_along_axis(y, "yaxis")
+            self.slice_along_axis(y, axis="yaxis")
         elif z is not None:
-            self.slice_along_axis(z, "zaxis")
+            self.slice_along_axis(z, axis="zaxis")
 
     def update_sphere(self, vertices, faces, B):
         """Dynamically change the sphere used for SH to SF projection."""
diff --git a/fury/actors/peak.py b/fury/actors/peak.py
index 931f9db5d..8fb1fa98d 100644
--- a/fury/actors/peak.py
+++ b/fury/actors/peak.py
@@ -3,6 +3,7 @@
 import numpy as np
 
 from fury.colormap import boys2rgb, colormap_lookup_table, orient2rgb
+from fury.decorators import warn_on_args_to_kwargs
 from fury.lib import (
     VTK_OBJECT,
     Actor,
@@ -62,10 +63,12 @@ class PeakActor(Actor):
 
     """
 
+    @warn_on_args_to_kwargs()
     def __init__(
         self,
         directions,
         indices,
+        *,
         values=None,
         affine=None,
         colors=None,
@@ -210,11 +213,12 @@ def __init__(
         self.__cross_section = self.__high_ranges // 2
 
         self.__mapper.AddObserver(
-            Command.UpdateShaderEvent, self.__display_peaks_vtk_callback
+            Command.UpdateShaderEvent, self.__display_peaks_vtk_callback(None, None)
         )
 
+    @warn_on_args_to_kwargs()
     @calldata_type(VTK_OBJECT)
-    def __display_peaks_vtk_callback(self, caller, event, calldata=None):
+    def __display_peaks_vtk_callback(self, caller, event, *, calldata=None):
         if calldata is not None:
             calldata.SetUniformi("isRange", self.__is_range)
             calldata.SetUniform3f("highRanges", self.__high_ranges)
@@ -275,7 +279,8 @@ def min_centers(self):
         return self.__min_centers
 
 
-def _orientation_colors(points, cmap="rgb_standard"):
+@warn_on_args_to_kwargs()
+def _orientation_colors(points, *, cmap="rgb_standard"):
     """
     Parameters
     ----------
@@ -306,7 +311,8 @@ def _orientation_colors(points, cmap="rgb_standard"):
     return np.asarray(col_list)
 
 
-def _peaks_colors_from_points(points, colors=None, points_per_line=2):
+@warn_on_args_to_kwargs()
+def _peaks_colors_from_points(points, *, colors=None, points_per_line=2):
     """Return a VTK scalar array containing colors information for each one of
     the peaks according to the policy defined by the parameter colors.
 
@@ -376,7 +382,8 @@ def _peaks_colors_from_points(points, colors=None, points_per_line=2):
     return color_array, colors_are_scalars, global_opacity
 
 
-def _points_to_vtk_cells(points, points_per_line=2):
+@warn_on_args_to_kwargs()
+def _points_to_vtk_cells(points, *, points_per_line=2):
     """Return the VTK cell array for the peaks given the set of points
     coordinates.