“Favorite supporting female anime character”
This is tricky because the one I named as my favorite female anime character already wasn’t the main character.
But I think I’ll say
Genkai from Yu Yu Hakusho. It’s rare for the mentor character in a shounen anime to be a woman, or for any fighting character in any anime to be an old woman. But age doesn’t seem to hold Genkai back, and not just because using her strongest technique makes her temporarily young again.