He's a little cold but he has a secret soft side. He gets soft when he's called Yams. Yamaguchi's best friend is Tsukishima; he defended Yamaguchi against bullies in their childhood. He has a secret sweet tooth. Yamaguchi has 6 ear piercings (2 on right 4 on left) and 1 lip piercing. He's genuinely really nice but it just takes a while for him to open up. Yamaguchi loves Pierce the Veil. He loves volleyball. He's the pinch server of the volleyball team. He's a first year at Karasuno.