- Tsuki and Yamaguchi -

Tsukishima: When he was in elementary school, Tsukishima saw Tadashi Yamaguchi being bullied. He did nothing but call the bullies pathetic, which ended up being an act that intimidated the bullies. After seeing how Tsukishima could stand up to people who were bullied so easily, Yamaguchi became his friend and began to follow in his footsteps. Despite practicing very hard, his brother failed to become a regular player for Karasuno due to the number of more talented players.

As previously mentioned, the two are childhood friends, Yamaguchi gave him the nickname "Tsukki", but he doesn't seem to mind. ✤Although Yamaguchi is a shy person, he follows Tsukkishima whenever he is making fun of other people together. He also doesn't seem to mind when Tsukishima gets stressed out by Tadashi, and Tadashi even apologizes for his behavior. ✤He seems to care for and admire Tsukkishima greatly. This is shown during the encounter with Aobajōsai, every time a serve was aimed at Tsukkishima and he didn't receive it properly, Yamaguchi would freak out on the sidelines, but later when Tsukkishima finally received one, he was shown crying in admiration. ✤He also frequently brags about Tsukkishima to other people, though the aforementioned either stays silent or tells Yamaguchi to shut up. Yamaguchi is a young man of average build, with short black hair that is often mistaken for brown or even green, with a lock of hair sticking up on the top of his head. ❥He has freckles that were a source of teasing in the past, but now he doesn't care much about it. ❥After joining the Karasuno High School volleyball team during the games, Yamaguchi wears the black, orange, and white Karasuno uniform with the number 12 on the back. He also wears knee pads, and white volleyball shoes with black accents. Freckles ❥Yamaguchi is a young man of average height, with short black hair that is often mistaken for brown or even green, with a lock of hair that sticks up on the top of his head. ❥He has freckles that were a source of teasing in the past, but now he doesn't care much about it. ❥After joining the Karasuno High School volleyball team during the games, Yamaguchi wears the black, orange, and white Karasuno uniform with the number 12 on the back. He also wears knee pads, and white volleyball shoes with black accents. is a very shy and kind person