Masachika Kumeno

Masachika is a young man of average build with short, spiky black hair. He has small, rounded eyebrows and two noticeable scars on his left cheek, and his mouth is usually set in a cheerful smile.

He wears the standard Corps uniform: a dark gakuran jacket, a white belt, and loose hakama trousers tucked into white cloth wraps around the ankles.

Masachika is warm and kind, the opposite of Sanemi's harsh, short-tempered nature. He took Sanemi under his wing and connected him with someone who could train him. Jolly and high-spirited, he frequently teased the younger man, inviting him out to eat and urging Sanemi to think of him as an older brother. He was sociable and charming enough to win over a grumpy old man and to amuse Shinobu Kocho with a funny story about Gyomei.

Beneath the playfulness he had a serious side. He was disgusted to learn that Ubume had tortured her own daughter as a human, and grew furious when the demon made excuses and falsely pitied Sanemi over his abusive home. In his final moments his kindness cost him focus when one of Ubume's captives moved to defend her, leaving an opening that proved fatal.

Before joining the Corps, Masachika lost a younger brother to demons. On one mission he encountered a young Sanemi, who was chasing the same demon despite not being a slayer and wounding himself to use his rare Marechi blood. Recognizing his potential, Masachika arranged for Sanemi to train under his cultivator and learn Wind Breathing, formally bringing him into the Corps.

The two later confronted Ubume, the former Lower Rank One of the Twelve Kizuki. Though they defeated her, Masachika was killed in the fight. For the victory Sanemi was named Wind Hashira, yet he remained bitter over the loss. Kagaya Ubuyashiki, who memorized the name and story of every fallen slayer, later passed Masachika's will on to Sanemi.