Hiori is shown to be a polite young man. He is very friendly towards Isagi and Nanase, providing useful information after their match as well as giving Isagi advice during the game. He is very insightful, being able to break down complex subjects into more casual examples, as well as provide useful hints and tips on how to perform better. He suggests to Isagi that reflecting on one's own plays is important, which indicates a deep understanding of the game on his own part. Hiori is also a very levelheaded person and player. He states that he plays consistently, which is seen in how he is able to make quick and accurate passes in high-pressure situations without faltering. Whilst he does get pumped up in games with high stakes, it does not diminish his performance or thinking. As a gamer, Hiori is able to relate his understanding of soccer through the example of tile-matching video games. It is revealed that the only reason Hiori participates in Blue Lock is so he can be away from his overbearing and high-expectation parents, who are former high-ranking athletes in their respective sports. As a child, Hiori was initially fine with appeasing his parents's expectations through football, but he really just wanted to be a regular kid. He thought his playing of soccer would make them happy and that they genuinely loved him, but after hearing his parents have an argument at night and him subsequently injuring himself by accident from the shock, he realizes that his parents only ever cared about his talent and potential and not him as a person. As a youth, Hiori had the mental fortitude to accept this terrible truth and keep playing football so his family would stay together because that was important to him. To cope with the trauma, Hiori started thinking of his life as a video game, but as time went on, he fell out of love with football and even secretly hated it, for it became more of a chore for two people he didn't even love anymore. Tabito Karasu is the only one who knows of Hiori's disdain for the sport. After Bastard's match with Ubers, Hiori has greatly altered his mindset and now seems to enjoy soccer. He wishes to produce the world's best striker so he can play soccer with someone who can sense his "world's best passes" and will leave anyone behind who he sees as "unambitious losers". Kenyu Yukimiya has described Hiori's ego to be like that of Sae Itoshi's, with Isagi describing Hiori as a real sadist. Hiori is also a lot more sociable and outgoing with his friends, as seen when he teased Isagi about how social media was saying that Isagi and Michael Kaiser would make the world's strongest duo, which Isagi angrily refused.Hiori is a tall and lean young man with short, slightly choppy cyan hair that falls down his face and soft feminine facial features, similar to Chigiri. His hair is neatly combed to sides, with a longer strand of hair falling to one side. He also has large, round, palish, cyan eyes. At Blue Lock, Hiori wears the standard-issued body suit (black with gray lines) and tracksuit. During Second Selection, he wore Team Red's #27 jersey. During Third Selection, he wore Team A's black #27 jersey. During the match against the Japan U-20, Hiori dons an official blue-colored Blue Lock player uniform with the #16. During the end of Bastard München's third game against Ubers, Hiori wears the team's red, black, and gold kit with the #23.