Befitting the sin he embodies, Mammon is very egotistical and greedy, and he doesn't care for the well-being of others, 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. Mammon acts friendly in front of his audience just to look the part and treats Fizzarolli like a son.

From what Fizzarolli has stated, Mammon is also a perfectionist. As his brand face, Mammon wants zero flaws in his brand figure whatsoever. He is also abusive, forcing Fizzarolli to do many stunts that put Fizzarolli in danger, such as being a living target for knife-throwing. However, Mammon also seems to show genuine concern over Fizzarolli when he starts having a panic attack, although it quickly changes to him looking threateningly and demanding for him to "get [his] shit together".

He has a foul mouth, even more so than most demons, even saying "c*nt" several times. He is also a chauvinist, publicly stating women "just ain't funny". Still, he claims to have reconsidered such comments upon seeing Glitz and Glam's performance and the twins becoming finalists.

There is also an ignorant side of him, such as when Fizzarolli is singing "2 Minutes Notice", he is unable to notice that the song is about him, even after Asmodeus says it is, and only realizes when Fizzarolli calls Mammon by name.

Mammon is also shown to be fairly confident in his own might, not being intimidated when Asmodeus, a fellow Sin, came to Fizzarolli's defense. Though he also shows he seemingly prefers not to fight directly, retreating when his threat to reveal Fizzarolli and Asmodeus' relationship fell flat, suggesting him to be somewhat cowardly despite his bloated ego. He is also known to be lazy as Asmodeus stated that he had not performed anymore clown acts and Blitzo called the last show he attended being an overhyped commercial.