Kaigaku

Age: 16 years.
Birthday: September 3rd.
Height: 164.5 cm.
Appearance: Fair skin, golden-brown eyes, short yellow hair of varying lengths, fading to orange at the tips. Before becoming a demon slayer, his hair was black—the color changed after he was struck by lightning during training.
Clothing: A light brown version of the standard demon slayer uniform, over which is a yellow-orange haori with a pattern of white triangles. On the shins are kyahan, tied with white bows with the same pattern. A katana with a golden lightning bolt pattern along the blade.
Familiar: Tyuntaro the sparrow.

Character and features:
Cowardice and insecurity: Zenitsu is often frightened, complains about his fate, asks others to protect him, and repeats that he will soon die. He has low self-esteem and considers himself useless.
Contradiction: Despite his cowardice, Zenitsu is loyal to his comrades and admires his teacher, Jigoro Kuwajima, for whom he is willing to risk his life.
Special abilities: Zenitsu has very keen hearing, being able to distinguish the sounds of demons and humans from a distance, and is also an excellent player of the shamisen and koto.
Unconscious Combat: In a dangerous situation, Zenitsu loses consciousness out of fear, as if falling into a coma. In this state, his reflexes and speed are greatly enhanced, allowing him to utilize his refined technique with great skill.

Age: 16 years.
Height: 167 cm.
Appearance: As a human, he is a muscular young man of average height with short, spiky black hair and a pair of dull, cold turquoise eyes framed by thick, arched eyebrows. He has an unfriendly face, permanently etched in a semi-permanent snarl. He wears a black kimono and a blue haori over it, patterned with small white triangles, similar to Zenitsu's.

Personality:
Proud - will serve anyone who recognizes his strength.
Smart - uses breathing techniques almost flawlessly.
Hates weak people - for example, while studying with Zenitsu, she harbors hatred towards him, as she sees him as a weak person.