Alright, I love Dragon Ball Z, but it's ridiculous that it's winning. There's about 10 characters from that series released already.
Street Fighter got my vote all day.
You forgot a lot of series though, sir.
Since you make custom models, I'd love for you to make some DarkStalkers or Earthbound characters.
Seriously. There's also way too much Sonic (and waaaay too much Shadow), and the Mario series is pretty much saturated now (though I'd still like Captain Syrup to be done, although she's more Wario series... which is not an option).
I voted Mega Man -- Mega Man X has been done to death, but there's hardly been any love for the classic series, which kinda boggles the mind. GBC did MM and Proto Man only very recently, Roll (TVC, over Toon Link) was pseudo-released by Pervy, and Bass hasn't had anything unlike his Sonic "counterpart." No one cares about Duo.
A lot of other series are getting more and more obscure and secondary characters (DBZ, Sonic...) while the main characters in this series are only just getting worked on.
Megaman.EXE could also use some love, especially since there's a model of EXE in Onimusha.
I wouldn't mind some Street Fighter characters either -- although all the big ones have been done.