This is a problem.

On my next game development, i'm trying to add realistic hitboxes.

But by fault of "polygon is not convex" i can't do it easily.

I need to add 4 hitboxes for EVERY SINGLE player (at least on this part)

That's why you can see the first one at the left wing, another at the center, another at the end of right wing, and the last one at the head part.