When the S.A is punished by the director of the school as a result of Tadashi lying to her, they are forced to attend a regular high school where Akira meets Yui, a girl who resembles her childhood friend Sayo. Initially wary, Akira avoids contact with her, but eventually apologizes and befriends her. However, Akira's fear that Yahiro would break up her newfound friendship results in Akira using extreme measures to protect Yui, who begins to feel awkward around her friends. When Yahiro investigates her for Akira's sake, he discovers that Yui stole some of Akira's jewellery and threatens her so that she will stay away from Akira. Though Yui had done so reluctantly because her family had financial issues that were forcing them to move, she agrees to Yahiro's demand, but she feels that she needs to say goodbye to Akira and almost gets hit by a car in the process. Yahiro saves her and they end up in Yahiro's home, where Akira finds them. When Akira believes that Yahiro has hurt Yui, Yui clarifies that Yahiro saved her and apologizes to Akira for stealing her jewellery. Happy that they are still friends, Akira ends up helping Yui's family and they keep in touch.
Chitose is the younger brother of Yahiro and is about nine years old. He initially appears in (Chapter 13) Hawaii during the SA's summer vacation when Ryuu (and by extension, the rest of the SA) is forced to entertain Chitose because he is the son of a client for his family. He is close to Ryuu, much to the chagrin of the twins, and it is implied that he has known Kei for a long time. Like his older brother, he dislikes poor people, which leads him to treat Hikari differently from others at first. However, when Hikari shows genuine concern for his well-being despite how badly he treated her, Chitose quickly becomes attached to her.
Kei and Sui's dad, age 36, who always looks young and baby-faced. He is very energetic and outgoing. Though he is the CEO of the Takishima company, he likes to escape from work and lets Kei handle his job, usually because people at business meetings tend not to take him seriously as a result of his young appearance. To Kei's chagrin, his father also frequently tends to drag his son off to meetings, occasionally in foreign places. Satoru also possesses superb fighting skills and trained in his youth to be as strong as a pro-wrestler; he particularly enjoys Hikari's company because it means they can fight, which Kei usually prevents from happening. He is a good friend of Hikari's father, whom he met through their mutual love of pro-wrestling. Before marrying Midori and into the Takishima family, his surname was Utagawa.
X is a former Pokémon Trainer who was shown to be very strong, even as a small child. However, the pressure he got from the paparazzi eventually got to him, which caused him to become a shut-in who refuses to leave his house despite his friends' protests. (Source: Bulbapedia)
Y is the daughter of Grace, a famous Rhyhorn racer. Since her childhood, Y has been raised by Grace to follow in her footsteps as a Rhyhorn racer as well. Annoyed at her mother's attempts to decide her future without her consent, Y rebelled and chose to attend Vaniville Town's Sky Trainer academy to learn how to become a Sky Trainer instead. (Source: Bulbapedia)
She participated in Operation "Silver Wild Grapevine", where she played the role of the head of the air base. (Source: Wikipedia)
Graduated from the Salvager training school with barely passing grades, he joins K2 Corporation through a relative. His father is the president of a major salvaging company. He is a new character introduced in the second series. Cute-looking but totally air-headed, Michikusa is prone to dressing cutely as well (including donning Delmo staff uniforms on several occasions), and using a kappa doll and squeaky voice to try cheering up Rion when her mood is down, which earns him frequent beatings by Rion because he just succeeds in annoying her. (Source: Wikipedia)