Ooh, I've been having trouble with this as well---every character ends up in the same like 3 or 4 ways lol, but I've been getting better ^^
My suggestions:
➡A character sneaker/stalker who's charming and goofy
➡A character that's super relateable (like they go through a lot of normal mental problems many people secretly do or have these random thoughts about doing illegal stuff lol or whatnot) Edit: Ooh might be fun if they didn't know how relateable they were and just thought they must have the most out of the ordinary life
➡A character that's really bad at a lot of stuff and just wants to be liked but realizes later on that they have a super helpful talent
➡A two-faced character who acts one way in public and another way behind closed doors (the two-faced-ness doesn't have to be just evil and good, it could be extroverted and introverted, acting strong in public when alone they're weak etc... A lot to play around with ^^)
➡A character with a "perfect life" but is actually pretty broken
➡A character with the "worst possible life" but actually has one of the best possible lives
➡A character who's all die-hard about most everything but has this really soft side that gets shown when ___ happens
➡A character with an infectious joy/attitude/aura
➡That one insane character that acts like they're straight out of a meme XD
Hope these help, I may add more later ^^
(Also plz help I think I just somewhat described myself in all those XD)