Kaigaku ( Upper Moon 6 )

"Kaigaku," a supporting antagonist in Demon Slayer: Kimetsu no Yaiba, is a demon affiliated with the Twelve Kizuki, holding the position of Upper-Rank Six. He was a former Demon Slayer and Zenitsu Agatsuma's senior disciple under the former Thunder Hashira, Jigoro Kuwajima.

During Hashira Training, Kaigaku went on a mission and encountered Upper-Rank One, Kokushibo, quickly surrendering to him to save his skin and later becoming a member of the Twelve Kizuki. As a human, Kaigaku is a muscular young man of average height with short, spiky black hair and a pair of dull, cold turquoise eyes. After becoming a demon, he gains many demonic traits like four black flame-like markings on both sides of his cheeks, elongated canines, sickly pale skin, sharp blackened nails, and pointed ears.

DETAILED INFORMATION:

• Rōmaji: Kaigaku
• Gender: Male
• Height: 167 cm
• Weight: 64 kg
• Hair Color: Black
• Eye Color: Turquoise with Black Sclera
• Combat Style: Thunder Breathing