I will go with this kind of Gimmick:

Rich Gambling Man
(Explanation):
Dynamo is a rich man who wants to enjoy his life. So he wrestlers. He also does business in his locker room. If you challenge Dynamo, Dynamo will accept. And he gambles from everything. And he enjoys it. But Dynamo is not very happy ot cheaters. If he gambles and someone cheats to win, Dynamo beats the cheater