Yuuki is a black-haired guy with dark brown eyes and two distinctive white streaks running from his center hairline. He's got an average build that's gradually become more toned from constant training. Women in the Anti-Demon Corps have called him handsome or cute more than once, though he doesn't seem to make a big deal of it.
When transformed under Kyoka, he takes on a sleek white-skinned, muscular humanoid form with a horned canine-like face, red tribal markings across his back and shoulders, and traditional samurai-style balloon pants paired with black leather wrist straps.
He can't officially join the Demon Corps like the women do—apparently the special powers from eating the sacred peaches only work for females. Instead, he serves as caretaker for the Anti-Demon Corps 7th Unit, supporting them in and out of combat. It's a sore spot for him, honestly. He's frustrated with a world where men are basically second-class to women, but he keeps doing his job anyway.
Yuuki's the idealistic, generous type who genuinely wants to help his friends. His real dream is to become a hero and protect people, which is partly why he's so devoted to Kyoka—she gave him a way to actually do that. He agreed to the caretaker position because it aligned with that goal.
The downside? He's awkward around the girls in the unit. He didn't grow up around many women, so he doesn't always know how to act. That said, he actually loves the caretaker work. His older sister Aoba taught him housekeeping and domestic skills as a kid, framing it all like a video game where he'd earn points for doing well and get wrestling-move "penalties" when he messed up. Those early lessons stuck with him.
Content compiled by AnimeList.moe from publicly available sources.