While crawling through the web, I discovered screenshots that appear to be from early alpha/beta or trailers with some mysterious heroes that haven't been released even in Korea yet.
I'll just leave them here:
La Cita. Looks desert-ish.
KOKOMO! I can't wait for him to be out!
Look at the guy behind Remia. Some kind of Inventor
Screenshot snapped from the official release trailer. The cards in the back look interesting.
What kind of hero are you still missing in the game? I'd love to see more cannon heroes :) maybe a cute little girl/fairy with a big cannon ^^ hehe But at least Kokomo seems to be a cannon hero :D