*chuckles* Well, I suspect that Killer Frost would be in direct competition with Ms Freeze. PowerGirl sounds like another heroine, albeit a rather twee one! As you can trell, I'm not well versed in the realms of comic book characters.<br/><br/>Here is a wiki page of all the villains from the Batman comics (http://en.wikipedia.org/wiki/List_of_villains_in_The_Batman).<br/><br/>Obviously avoid ones that have been taken. The Joker is off limits as explained previously.<br/><br/>Feel free to do a female penguin, female riddler... remember this is next generation.