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Melon is a sociopathic, ruthless, deranged and cunning individual who hides his murderous peculiarities beneath a veneer of affable innocence and seemingly childlike curiosity. His knowledge in psychology has allowed him to gain a deeper understanding of how people's minds work, which in turn allows him to more easily manipulate people. As a sociopathic villain, Melon often hurts others without remorse, seen when he almost killed Legoshi with a bullet to the stomach and when he murdered an elephant with a syringe.

Melon's sadomasochistic tendencies and cruelty are most prevalent when he is getting tattoos, as well as brutalizing Legoshi and the Shishigumi. As the new head of the Shishigumi, Melon is cruel and harsh towards the members, unlike Louis who is a firm yet benevolent leader.

Melon claims that the only place where he says he can be himself is at the Blue Dragon tattoo parlor, because it is the only place where he can bare himself without terrifying anyone with his appearance. But, there is a chance that this might have been a lie, since he had used the place to trap Legoshi and try to kill him.

Melon seems to be a masochist, since getting a tattoo from the sloth Holger excited him immensely, making him blush and stick his tongue out in pure bliss. Melon claims that being inflicted with pain is the only way for him to feel alive, since he can't taste anything due to his hybrid nature, along with the contradictory senses he's constantly bombarded with.

Melon hates his leopard heritage and tries to cover his spots with melon leaf tattoos. When his body went through a dramatic change, he tried to gouge his spots out, but could not because his claws were not as developed as a carnivore's. Desperate to stop changing, he shot off the hand of the leopard Madaragumi leader, believing a feline's claws would be capable of gouging out his spots.