Kei Tsukishima.

Tsukishima is very tall and of average build for a volleyball player. Despite being a first year, he is the tallest player in Karasuno. He has short blonde hair along with golden brown eyes. He is often seen with a frown or a cynical smile on his face.

After joining the Karasuno volleyball team, during matches, Tsukishima wears the black, orange, and white Karasuno uniform with the number 11 on the back. Additionally, Tsukishima wears white and green knee pads and volleyball shoes. He is also the only player on the Karasuno team who wears glasses. Since chapter 109 of the Manga, Tsukishima began wearing prescription sports glasses (a gift from Akiteru) in matches.

Outside of matches and practice, Tsukishima wears a black gakuran, Karasuno's male uniform, and headphones around his neck.

Tsukishima is very forceful and will sometimes irritate his teammates due to his antagonistic nature and sometimes other teams due to his smug, proud and savoring attitude when his opponents . They see him as a nuisance as seen with Tendō and Shirabu. Whenever someone does or says something stupid or silly, they are usually seen laughing in the background. However, he appears to be intimidated by his superiors, as Daichi does not scold Ryūnosuke Tanaka for harassing Aoba Jōsai even though he did so too, or backs down when Ennoshita calls him out. Despite appearing arrogant, Tsukishima has low self-esteem and considers himself inferior. He is first noticed as a surprise by Kuroo, who accidentally irritates him by suggesting that he will lose to Hinata, to which he says that she is already beneath him. After the Shiratorizawa match, despite being the MVP, he has found himself crippled by only being able to block Ushijima's spikes once, and it only adds to how little he believes in himself and his accomplishments. Although Tsukishima maintains a personality of someone who shows little interest in anything and wouldn't do something he didn't like or enjoy, he really enjoys volleyball. He initially refrained from putting too much effort into volleyball and being too passionate for fear of suffering the same fate as his brother. However, after his confrontation with Yamaguchi and hearing Bokuto's inspiring words at the Tokyo training camp, he began to take the sport more seriously and eventually found his passion and motivation for volleyball when he blocked Ushijima. Tsukishima remains calm, for the most part, but can be seen visibly upset when people underestimate him or tell him what he can or cannot do, and uses it as motivation to prove them wrong. He also says things like "It's not a competition" to Hinata, but then immediately does something to make him jealous, like the time difference attack during Shiratorizawa's match.

His zodiac sign is Libra. Favorite food: strawberry cake. He has a habit of playing with his fingers when he feels nervous, especially shown when he asks Coach Ukai for advice on blocking. He keeps toy dinosaurs on a shelf above his desk. Tsukishima seems to be good at studying, as he belongs to Class 1-4, known to be a college preparatory class.