Arrow's fourth season is exploring the mystical more than ever so now seems like a good time to introduce the character of Zatanna into the fold - and then maybe spin her off into her own series. A stage magician who actually has magic powers, Zatanna is one of the strongest female characters in DC's roster. In the comics, she is often a member of the Justice League but she could definitely hold her own in a series - one that would explore a different sort of mysticism and magic to the more occult-flavoured Constantine (a character who is actually a love interest of hers in the comics). The sultry sorceress would also make a good counterpart to the squeaky-clean Supergirl, who is currently the only other female DC character with her own show. Sort it out, guys!