Before he was old enough to realize his surroundings, he was sold to a slave dealer and managed to end up in the Port Mafia. For the rest of his short life, he was forced to wear a collar that was controlled by Ace's ability. Karma wish to be free from the collar and gain freedom. However, he believes defying and defeating Ace would be impossible. His dream is to become the boss of the Port Mafia, but he finds stupid to believe he this dream could become reality.
He is quite soft and playful.