A new fight video was released of Woder Woman fighting Harley, In the transition we see Killer Croc, The Riddler, The Penguin and Two-Face. So I think the Arkham Assylum page should be updated, A Two-Face page should be opened and maybe some more clear images of the characters should be added? http://www.youtube.com/watch?v=DtHpLes2kK0
Go to the characters you want in your sub catagorey and add them to the Non-Playable Characters Catagorey (Which can be found at the bottom of there page). After that click on the Non-Playable Characters catagorey (Which can be found at the bottom of there page) then when your at the catagorey page add that one to the Characters Catagorey. :)
I love Aquaman, but my least favourite variation on him is when he's potrayed as the king of atlantis who hates the land and only cares about protecting Atlantis and the sea, rather than being a selfless hero who helps protect everyone in need.