One of the great Oni leaders in Japan, Shuten-douji was a human child of monstrous strength, born to a human and the great dragon Yamata-no-Orochi. An unbeatable drinker during his time as apprentice priest in Mt.Hiei in Kyoto, he was constantly called a monster and a demon by everyone around him. After becoming an Oni due to his on idiocy, Shuten-douji cursed the world and became the feared Demon King of Mt. Ooe.

He can be a very chill person. While he has been summoned as an Avenger, he's retained most of his self-control (not that he had much in the first place). He seems like he's just another human being, but he's a demon that lives for thrill. His only wish is to be accepted by others. To be loved by others. While he extends his hand to others like him, he hopes that eventually, someone will reach out to him as well. The only thing that makes him go over the edge is a Human. His very existence as a servant is one who loathes them, and he cannot help but rudely speak to them when he cannot remove them from his sight, in a sarcastic tone.    His only solace is that he's not alone. Neither in his hatred or his person.

His hatred for human beings knows no bounds. His grudges born from his state as an outcasts take more precedence, and his anger against them has been amplified even more. The fear from Humans empowers him.

Humans always forget the pain they inflict on others, but as an Avenger, the wounds inflicted will never be forgotten. The Avenger's attacks instill a sense of fear into the enemy, locking them in place.

As long as he lives, Shuten-douji will continue to terrorize humans, until the day he dies.

The child of Yamata-no-Orochi, he's granted Divinity. This has dropped heavily due to him being an Oni.

While it does not have much of an effect on human beings, his fellow Oni show him a respect only a monstrous king can garner.

A Skill that represents the superpower and demonic nature of an Oni. With the exception of oni and those that are Mixed-Blood beings with Oni blood, one is not able to acquire this Skill. It is even a mixed Skill of the Natural Demon Skill, Monstrous Strength Skill, Charisma Skill, Mana Burst Skill, etc., but in Fate/Grand Order, the effects has been adjusted.

Even at death's door, the servant will continue fighting. This skill is given to Shuten due to his legend, where his decapitated head still attacked Minamoto-no-Raikou.

Never beaten by anyone, Shuten-douji is a master of drinking. The poison fed to him by Minamoto-no-Raikou combined with his being as a servant, making his body heavily acidic. Any matter that enters his body can be compressed into an alcoholic drink (if he so chooses).