^can't get more non-specific than that :P
anyway, I'm 17 (18 in 3 months) and I wish I could create mugen characters.
however, I DO know a guy who has created a few characters (I have yet to find out whether he released them or not)
he has created (or so he says)
an edited version of apocalypse with an easier to execute moveset.
I haven't seen him over the summer so he might have done more. When I see him again, I'll try (again) to get him to put it on a mugen site or esnips. (or at least show them to me, as of now I think he was lying, but whatever.)