Kaigaku

Kaigaku's personality is defined by his arrogance, pride, and inherent cowardice, which he masks with ambition and a deep-seated disdain for perceived weakness, particularly in Zenitsu. He is an opportunistic and selfish individual who seeks power, ultimately betraying the Demon Slayer Corps to become a demon to save himself. Despite a potentially pitiable orphan past, he became a ruthless and hypocritical individual who valued self-preservation above all else.