What do you call those hats with cat ears on them?
They are called Knitwits or a Catarina hat.
If your looking for the furry ones it is a Catarina hat.
The hats that you can unlock in Find Mii are as follows: Unlocked randomly: Mario's Cap Luigi's Cap Toad Hat Bowser Hat Red Pikmin Hat Blue Pikmin Hat Yellow Pikmin Hat Link's Cap Samus' Helmet Metroid Hat Kirby Hat Cat Ears Dog Ears Bunny Ears Unlocked after finishing Find Mii: Crown Unlocked after finishing Find Mii twice: Ultimate Helmet To get all hats, you must finish Find Mii twice.
Do anime characters that transform partly into cats keep their human ears also or do they disappear?
I think they disappear. I never really payed attention to that, but from what i have seen in the show 'Shugo Chara,' I do not recall Ikuto's ears showing. But then again, that show doesn't really show the human ears. When the cat ears appear, they are above the spot where ours are. Guessing that it would be strange for them to add cat ears while the humans' are still there, I'm sure that only…