The captain and setter of the Aoba Jousai High School Volleyball Club. Oikawa was also Kageyama's senpai when they were attending Kitagawa Daiichi. According to Kageyama, he is a very talented setter and volleyball player with a bad personality. Oikawa also frequently makes cheerful remarks, but follows them up with serious or intimidating afterthoughts. Despite his flirtatious and blasé exterior, Oikawa is extremely intelligent and cunning, to the point of his own teammates stating they wouldn't want to be friends with him because he figures out everyone's weakness. He holds a grudge against Kageyama, whom he mockingly calls Tobio-chan. This is due to his feelings of inferiority when compared to Kageyama, who has been hailed as a genius setter since their time spent at Kitagawa Daiichi. Kageyama can unintentionally bring out the more childish or rash aspects of Oikawa's personality. (Source: Haikyuu!! Wiki)

Kaito Kuroba, son of legendary magician Touichi Kuroba. One day, the mysterious phantom thief Kid (Kaitou Kid) returned after 8 years following his disappearance. On that same day, Kaito discovered that his father, who died 8 years prior, was the phantom thief Kid. Kaito confronted this new Kid, who turned out to be his father's former assistant Jii Kounosuke. From Jii, Kaito learned that his father was in fact murdered. He decided to take the identity of Kid and carry out heists in order to bait those who killed his father. Kaito eventually met his father's murderers, and learned that their goal was to find the Pandora Gem that would grant them immortality. He swore to find the Pandora Gem before them and smash it to pieces. In his civilian identity, Kaito is a normal, if somewhat popular, high school student. He tends to get in trouble for teasing his girl classmates, especially his childhood friend Aoko Nakamori. He also has an extreme fear of fish. As "Kid the Phantom Thief," Kaito has a calm and elegant demeanor. His most remarkable trait is the ability to disguise as anyone. His signature gadgets are the card gun and the hang glider cape. Kaito usually returns his prize when it isn't what he looks for. Kaito first appeared in 1987 as the main character of "Magic Kaito," he only became widely known in 1997 after his appearance in "Detective Conan" as an antagonist. Since then, Kaito has occasionally appeared in "Detective Conan" manga, anime and movies, usually as an antagonist, but sometime as an ally.