Mirrorsim19, Can just delete them. Unity is a powerful tool.

NogameNolife2541, If they're broken in the sense they're old dynamic bones, then you can convert them to PhysBones using a tool like, FluffsToolbox, Or if the bones just need tweaking then, there are plenty of easy tutorials. One I found helpful was from the channel
"Sipp's Avatar Box" and a tutorial titled Avatar Dynamics Tutorial - PhysBones.

Anyone know how to fix the hair bones？

Can you turn off the cat ears or do we have to have 4 ears?

ty for posting this avatar I appreciate <3