Roku Hakashi is a student at Hope's Peak Academy and is the Ultimate Monster. He is known to be intimidating, blunt, stubborn, arrogant, prideful, hot-headed, and reckless. Though despite the bad boy traits, he's also known to have a comical side, often shouting out of irritation and coming to a logical decision himself or being weirded out by the most awkward or questionable things. He was once a merciless and frightening figure who has no care for others, but began to change his perspective when a princess of a darkened world, who was the Ultimate Pacifist, showed him how to be merciful and considerate towards others, making him have a change of heart. Roku was the bully of Yukoro Makita due to his quiet nature, but began to forge a bond towards each other as time progresses and their journey moving forward. He is the male counterpart to the female monster Susie, who originates in the Deltarune Dimension.