I'd be happy to assist in sprite capturing, I can rip some bosses/enemies whatever from the simpsons arcade game.
Also do you recall the Homer simpson made for Mugen ?
you get a much more diverse Homer with him, he was custom made from scratch.
(I cant provide a link, the mugenguild is down, but I have a copy of the char for mugen if you like, he also made a Krusty which I have also. both chars are the same size of most capcom fighters)
also here's a lin to the original arcade chars for mugen -
http://www.ineffabile.it/games/Mugen/simpsons.htm