Suna Rintarou.

Rintarō Suna (Japanese: 角名すな倫太郎りんたろう, Suna Rintarō) is a second-year student attending Inarizaki High. He plays as a middle blocker on the volleyball team.

Suna has dark brown, slightly combed-down hair, with a few strands sticking out at the top of his head and middle-parted bangs. He has grayish-yellow, narrow eyes, and thin eyebrows. He is often seen wearing a blank expression.

Suna appears to be a deadpan, quiet person. He's more expressive with his thoughts, wishing he could find a reason to poke fun at Kita or make snarky remarks against Tsukishima and Tanaka. He's also quite analytical, being able to manipulate the opposing blockers and figuring out that Tsukishima was baiting him to shoot around his block. He tends to slack off when his team has a huge point lead and seems to be winning the game. However, he is shown to quickly get back on track when he is aware that Kita is observing him.

Suna is from Aichi Prefecture, but he got scouted and came to Inarizaki in Hyōgo.

Sharp Game Sense: According to Coach Ukai, Suna possesses a sharp instinct, akin to a sixth sense for the game. He can quickly adapt to the opposing team's pace to put up an effective defense. During the match against Karasuno, he reacts almost immediately to Kageyama's toss to shut down Tanaka's spike.
Wide-Range Spike: Suna using his torso to spike past a block.
Suna's strong suit is the incredible breadth of his spiking range. In addition to using his shoulders, he is capable of rotating his entire upper torso while spiking to increase his range, all the while retaining spiking power[5]. He would use his approach run and body direction to manipulate the blockers into guarding one direction before he attacks to a different angle.
Blocking: Suna has proven to be a troublesome blocker to Karasuno during the Spring Tournament. He is shown to be similar to Tsukishima in analyzing his opponents to determine who he will need to block. Suna is also very quick in getting his block in place.

Atsumu Miya and Osamu Miya: Suna's current concern reveals that the twins and their antics bother him and that he does not want to get dragged into any of it. Despite Osamu seemingly having a personality similar to Suna's, the blocker doesn't forget that he is still Atsumu's twin brother nonetheless, so he doesn't try to meddle in their conversations or attempt to stop them in their quarrels. Despite this, he still answers to many of Atsumu's snide remarks and, at times, records them or takes pictures whenever they fight.
Shinsuke Kita: Suna seems to be the one to be the most cautious around Kita when in a game due to the pressure the captain can put on anyone. Knowing that Kita is always watching them, Suna acknowledges that he cannot slack off like usual as Kita will easily spot this and point it out. Having seen how "perfect" Kita is on a regular basis, Suna has admitted that he wishes he could catch the captain doing something silly, such as using baby talk toward a pet.