Ai Hayasaka is a second-year student at Shuchiin Academy and a valet of the Shinomiya family. She is a member of the Hayasaka family, who have served the Shinomiya family for generations, gaining their trust. She wears blue colored contacts. Having been personally assigned to enter Shuchiin Academy with her, Ai supports Kaguya Shinomiya in her high school life and has been a part of Kaguya's life for ten years. Because of their close relationship, Ai is one of the few people around to which Kaguya's amiability is not an act. Even if she demonstrates maturity as a valet, Ai still has the concerns of a young girl, such as caring to be in fashion and going out with friends, even if she does not have much time for herself due to work. Ai helps Kaguya with the struggles about her feelings for Shirogane.

Obito Uchiha was teammates with Kakashi Hatake and Rin under the Fourth Hokage. Obito was frequently late for missions due to the random good deeds he would carry out, which greatly irritated Kakashi. He also seemed to have had a crush on Rin. When Rin is kidnapped during the Kakashi Gaiden arc, Kakashi, the current team leader, insisted that they continue the mission instead of saving her. Citing that those who do not save their teammates are no better than trash, Obito refused and eventually managed to persuade Kakashi to join him. During their rescue effort, Kakashi lost his left eye as a result of an enemy ninja's attack, and Obito awakened his Sharingan to save Kakashi and defeat the ninja. Once finding Rin, Obito again saved Kakashi by pushing him out of the way of a rock slide, though has his right side crushed in the process. Unable to escape with his teammates, Obito had Rin implant his remaining Sharingan eye in Kakashi's damaged eye socket as a gift.