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. In chapter 599 it is revealed that Tobi is actually Obito Uchiha who was teammates with Kakashi Hatake and Rin under the Fourth Hokage.
Ikuno Komaki is Manaka's little sister who has a chronic illness that keeps her in the hospital. Prior to episode two of the OVA, her health improved and she was released, thus she was invited to the beach along with her sister. Ikuno is very supportive of her sister and she tries her best to support Manaka in her affection towards Takaki.
A girl who Shinkur� lived with when he was young and also his sparring partner. Her soft demeanor (albeit with yandere tendencies, triggered by other girls approaching Shinkur�) hides the fact that she is a strong fighter, whom Shinkur� acknowledges to be much stronger than himself, despite her being older by just one year. Yūno is upset that Shinkur� has not realized he was her first love. Even now, she still has feelings for Shinkur�, always finding excuses to spend time with him, such as cooking meals for him. However, her advances tend to be very threatening (most likely because Shinkur� always has another girl with him) and scare him into just letting her hear what she wants. Yūno resents the decision Shinkur� made in deciding to move out her household to live on his own and fears he will change into a hooligan. She has made it very clear that she wants him back in the H�zuki household. Yūno has a younger sister named Chizuru, who is five, who also has a crush on Shinkur�. Even though the H�zuki family are no longer assassins, their grandfather expects Yūno and Chizuru to carry on the H�zuki family martial arts. In the anime, Yūno is much more assertive in her advances towards Shinkur� and does not appear to have the yandere tendencies.
She is yet another tenant of the building Shinkuro lives in. She always wears black and calls herself a very sinful woman. She likes cats and usually keeps to herself except when it comes to Shinkuro and Tamaki. Her attitude can be considered sarcastic most times.
A woman who works as the middleman for the Akuu Company, a secret mercenary group of assassin and skilled individuals.
A 2nd year student at Tenbi Academy and a member of the disciplinary committee. Her maken is called "Maken Scale Compressor" which allows her to alter the volume and mass of inanimate objects.
She is the secretary of the student council as well as a member of the disciplinary committee. She seems to enjoy Yaoi manga. Her maken is called "Comic Star" which allows her to alter the state of physical objects and allows her to use her imagination to project special effects from Manga into reality.