Goodness what a thinker!!! Honestly its hard to pick favs since I have so many but off the top of my head they'd be Maverick, Coraline, and Layton.
Coraline is an oc I've had since early highschool that really helped me develop lore for my demon universe and shes just all around fun!!! She doesn't feel bad for eating humans since she's so different from them now, but her vampire boyfriend caused heavy trauma to the point she has a trauma response when hearing kids playing now lol

Layton is fun because he's my first proper "slasher" character which I'm having fun exploring, planning out how he picks prey or all the lil projects he does between murders is interesting. His childhood and family were awful yet he clings so tight to the idea of family it drives him to killing to have it again

Then Maverick!!! I have so many ocs/universes but his is the one im most proud of, his story has bloomed into so much more than i thought it'd be thanks to Ira and other friends. His story is full of heartbreak and overall plenty of bad but under it all is a man that's desperately trying to be better and accept himself until he accepts there isnt anything good for him in this world unless he takes it