There are there types here, Steve, Alex, and Thin. This will swap the meshes out for the appropriate models.
Bend Smoothness
This controls the sharp/smoothness of the bend, setting it to -0.1 recreates the full normal sharp bend of a Minecraft Character while setting it to 1 makes the bend noodly.
Body Bend Shape
Controls the sharpness point of the bend shape for the body.
Arm/Legs Scale
Scales the arms/legs down on the X and Z axis to force the arm to be thinner.
Fingers/Thumbfill
Enables the fingers and finger bones for the appropriate arm, and thumbfill controls whether the thumb gap will be filled in when the hand is closed.