Really the only thing I would do is add missing bios and renders for characters. I still need to build a actual desktop pc so I can do renders much more quickly. Other than that I'll just add new characters to the game which come during the mid to late game. Any mods feel free to post up it doesn't matter, you can even use the characters I put up.
Only thing that is actually missing are the belt images and free renders which I have yet to sort out for duplicates.