Arthur Brown (Clue Master)

Anyone who read Scott Snyder's Batman Eternal probably has a bit more appreciation for Clue Master that the rest of the Batman fans. Sure he's not the most sinister or well-known bad guy from DC comics, but hey, this is an amazing opportunity for unappreciated characters to get their own time in the spotlight. Since, Clue Master is not such a big deal, the writers can easily kill him off at some point without invoking the wrath of fans. Killing of the person we thought was the Joker turned out to be fine, however, it would be hard to pull it off with someone else. In other words, Clue Master is an amazing opportunity to create a more compelling character for whom the audience can fear whether he'll live or die, like with Fish Mooney. He can be Riddler's mentor or rival, for example, and aid his character development at the same time.