Overall, Yaku is a rather honest, straightforward, and hardworking person who's very confident about his skills as a libero and looks out for his team, especially first-years Lev and Shibayama, and Kenma. He will frequently engage in lighthearted scuffles with his juniors, and will sometimes eat their food too. Despite this, he can also be incredibly short-tempered, especially concerning Lev, who seems to find Yaku's angry outbursts "scary", although these outbursts are typically in response to