I don't have any earthly clue what character to app

you don't necessarily have to app anywhere first! you could try something low-stakes to voicetest, like putting a character on a meme. you could also throw someone on a test drive meme on any game that might seem interesting

as for who to app though ... hm u just have to search ur soul

who would be most fun...

i dunno................... I watch too many things with child main characters to be like "yeah I wanna bring this character"

And I dont... really get hyperfixated on like, a character like some people do