Garfield and M'gann are a cute brother/sister thing in Young justice, so that could work if you're willing.  When did he show up in Gotham, or is he 'fresh off the boat', so to speak?  As for Artemis, not sure what to classify her beyond just friends with the poor kid.<br/><br/>And speaking of music, I'm not sure if I want theme music for my two leading ladies, but if I were to choose anything, any suggestions folks?  I might have an idea or two, just haven't really given it any thought.