Dumo is a Japanese sumo wrestler gone bad, having decided to embark upon a life of crime.  Instead of the limited celebrity, in his own nation, which came of being a sumo wrestler, he preferred the superstardom of super villainy.  He makes use of his sumo wrestling skills to bulldoze his way through his capers.  And he is one of the many super villains who appears annually at Villain-Con.

Dumo, unfortunately, is also something of an aggressive hothead, and not terribly bright.  And his short temper has led him, in the past, to eat his own henchmen...which makes working for him a rather risky prospect!  Recently, however, he has taken to working for Scarlet Overkill...the super villain everyone wants to work for.