|Name Kanji||雄一大鳥 Ootori Yuuichi|
|Relatives||Yoshio Ootori (Father)|
Fuyumi Ootori (Younger Sister)
Akito Ootori (Younger Brother)
Kyoya Ootori (Younger Brother)
|Manga Debut||Chapter 77|
|Anime Debut||Episode 24|
Yuuichi Ootori is the first-born son of the Ootori Family and destined to become the next family patriarch upon Yoshio's passing. He is Kyoya's eldest brother. Yuuichi has already graduated at Medical School and works with his father at the same hospital, and as Kyoya defines in the anime, he is the natural heir of Ootori's companies, because he is the eldest son of family. In the anime, he's only seen in flashbacks when there's a close up of the family portrait; in the magna, he rarely appears.