Because he is extremely rich, Diamondo has a very vain, self-centered demeanor. He is shown to be impatient and short-tempered, with an obsession for attention. There are times where Diamondo is more laidback, usually when he’s surrounded by leisure and riches, or hanging out with his friends (i.e. Best, Bester, Flip Flop, Rocky, Toot and Grafifi). He also likes hosting parties in his mansion, of which each and every one of them happen to have different themes.