Some series suggestions that I'd add:
- Mario (Rosalina or Peach)
- Pokémon (a trainer like Emma from Z-A or a Pokémon like Gardevoir)
- Sonic (Rouge, Amy, Blaze, etc.)
- Umamusume (or any other anime-style characters)

A few suggestions that I got from posting this thread on Discord:
- The Mane 6
- May from Pokémon

Maybe Judy Hopps? Or maybe some humanoid characters like Pomni?

My most recent brainrot was Henya, but for a while it was actually Crunchyroll-Hime (and Pomu too).

I've also been told that Masc Amy sounds like Jet the Hawk lol.

Someone told me that Fem Shadow kinda sounds like Lightning from Final Fantasy XIII and I totally see the vision:
www.youtube.com/watch?v=gKkC...

Masc Cream and Fem Big (Note: I had to pitch down the reference audio for the Voice Change feature so that Cream could sound masculine):

#TG #R63 #Genderbend

Masc Amy and Masc Rouge (something that I've noticed is that FTM conversions tend to be more unstable):

#TG #R63 #Genderbend

Fem Tails and Fem Knuckles:

#TG #R63 #Genderbend