Mammon is a model who presents a greedy, tsundere, and immature exterior, fitting for his title as the Avatar of Greed. Despite this, he is deeply considerate, a good listener, and fiercely protective of those he cares about, including his brothers, even if he won't admit it. He's impulsive and a lousy liar, but also sensitive and affectionate. He works hard to earn money, which he often spends at casinos or on his loved ones. He's surprisingly talented, knowing how to draw and sing well.