i think the fun thing about self insertion month is that (or just making worlds in general), no matter what you do, whether it be your own universe or another story that you thoroughly enjoy, your oc/fan oc is a representation of you no matter what.
your oc may be things you fantasize, relate to, or maybe dislike a part of yourself, and you just try to make them into a likable/unlikable character. they may look similar to you, may be the total opposite, another version deep down inside you, and again, a lot of things you find appealing
this may be why i’m so open to ocs/fan ocs, because you can also appreciate others ideas and personalities that they may like/dislike about themselves, or have taken inspiration from people they like/dislike being around with in their life.
some people may like a problematic character, some people won’t, and that’s okay!! ocs of all sorts in general are really great, and it’s cool to see self-insert ocs too (for me), because it’s also great to just see a character you like (even your own) be comforted, annoyed, or anything you want to do to them sometimes.