He is a life-long gambler who is able to use others' tells to win. He is also the owner of the secret Million Colosseo casino, using his powers as the Money Dopant to enforce payment of debts. By tricking debtors into having them bet their life force in a game of chance, many debtors lose their life. Shotaro and Philip are able to beat Kaga out of Life Coins in a winner takes all game of old maid. After the Money Dopant is defeated and the Money Memory broken by means of the Metal Branding Maximum Drive, the Life Coins are unsealed and everyone is returned to normal.
As Money Dopant, he uses his powers to seal their life force into pseudo-memories called Life Coins after they lose. As he holds the Life Coins in his Dopant body, his destruction would cause all of the people to die.