To add compatability, add this to load.gml

sprite_change_offset("[Regular Head Sprite Name]", 45, 86);
sprite_change_offset("[Idle, Dash, Walk, Crouch, Roll Forward, Waveland Sprite Name]", 32, 73);

This obvious but make sure the idle, dash, etc sprite names are separated.

Also add this to init.gml

cstwidle = sprite_get([Head Idle Sprite Name])
cstwheadspr = sprite_get([Head Sprite Name])
cstwdash = sprite_get([Head Dash Sprite Name])
cstwcrouch = sprite_get([Head Crouch Sprite Name])
cstww = sprite_get([Head Waveland Sprite Name])
cstwr = sprite_get([Head Roll Forward Sprite Name])

You maybe askin where do I find the sprites and the answer is it's in the character's files. So go to the download file/sprites and you should see templates there. Make your own head then slap it across some of the animations and you're good to go.

You should be good to go. This feature is heavily in beta so dont expect some 5 star sh*t