Your characters have very deformed proportions. It seems like you took an animation designed for a character with more realistic proportions and retargeted it. Animation retargeting generally only gives you good results for characters with very similar proportions. When the characters are too different, then you usually get better results if you redo their animations from scratch.
When you have characters with deformed proportions, you need to design your animations in a way which accounts for those proportions. The physique of a character affects the way it moves. Your characters look super cute, even without textures. But they are simply physically unable to perform the same motions a character with realistic proportions could perform, at least not in the same way.
And even if some animations sort of work without clipping, they might not necessarily be appropriate for the general look and feel of the character. Animating chibi-characters can be a lot of fun, because you can really exaggerate their motions and body language. And it would be a shame to not make any use of this creative potential.
I am looking forward to playing with those characters in their finished form.