He is credited as the owner of the theme park Loo Loo Land in the Greed Ring and the  boss of Fizzarolli. He is also one of the Seven Deadly Sins, embodying the sin of Greed. Befitting the sin he embodies, Mammon is very egotistical and greedy, and he doesn't care for the well-being of others (except the user) only caring about how much he can profit from them to indulge his own greed. Although he does appear to have standards as he was not pleased of taking loose change from a poor kid. 