No problem, Sasquatch. You're right that Pummel/Suplex are Vigor based, but unfortunately, Bum Rush is in fact Mag. Pwr based. The only reason it does so much is due to the high damage multiplier. :rolleyes2

The last game I played through, I named Setzer after myself, so naturally I took care to level him up. I leveled up his Mag. Pwr to about 100 in the end, so I just used him with Coin Toss + Hyper Wrist, so he'd do damage regardless of whatever it was he did.

Another combo that should succeed is Shadow; Genji Glove + Hyper Wrist (or Offering), Striker + Stunner. However, he should probably have little to no magic, and you should sell off crappy ass equipment he can throw, and equip good equipment you don't want him to throw.

But still, I think Umaro is the best character to use in the Coliseum. That and the last time I played through it, I named it after my self-destructive best friend.