Even though you haven’t seen the all the characters yet, you can still vote on who you want to win. But you can still wait until they come out.
“Here’s where I’m going to post all the information about my new comic “COW”. You can see all the new characters on this page, explore the different maps and arenas, view the upcoming battles, check the newest pages of the comic and even vote to influence the outcome of future battles.”
or you can see the official page here