Onmasa doesn’t take anything seriously, constantly joking or yawning in very serious situations. Sincerely believes he is better than everyone else, and, unlike Ruku, is a total narcissist. He’s constantly slandering others, not really caring for their tears or anger. It’s always about how he’s better than everyone else, and the only one of them who deserves to be at Hope’s Peak. He didn’t pick any of his fellow Ultimates, and sees them all as stupid little rats.