Yo Hiori (氷ひ織おり 羊よう, Hiori Yō?) is a contender of Blue Lock, who currently plays as a right back for Bastard München during the Neo Egoist League. Hiori is a wise but soft-spoken forward prodigy who was trained from birth to solely play football and be the best in the world by his parents, but Hiori with all his talent and intellect is looking for a purpose in life outside of his parents expectations. When first introduced at the beginning of Third Selection he was ranked 27th out of the remaining forwards. He played as a right wing and right back for the Blue Lock Eleven against the Japan U-20 team.

He has choppy cyan hair that falls down his face and has soft feminine facial features, similar to Chigiri. His hair is neatly combed to sides with a longer strand of hair falling to one side. 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.

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 can be 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, as Hiori is able to relate his understanding of soccer through the example of tile-matching video games.

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