Giganta and Killer Frost are viable characters. If you don't mind, can you let me know what you mean by versions?

Grodd or Luthor not so much. I want to keep the big power players in the background for now.

I'm only just getting into DC myself, having been a mostly Marvel fan, there are a lot of characters I still know little about. I have however watched a lot of the Arrow and Flash CW shows. And I am slowly collecting the Eaglemoss DC collection of books among others.