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.
Mr. Popo is an immortal djinn who lives with Kami in Kami's Lookout and is bound there eternally as the gardener and caretaker. He has served every other Kami (God/Guardian) of the Earth since the beginning of time. He was trained by the recent Kami himself and trained Goku for 3 years in order to fight Piccolo. Mr. Popo is an excellent martial arts master. When he is introduced in Dragon Ball, his fighting prowess is far superior to Goku's in nearly all respects, when the two meet at the Lookout. Mr. Popo and Kami train Krillin, Tien Shinhan, Yamcha, Chiaotzu and Yajirobe in order to help combat the approaching threat of the Saiyans, through many different training methods, including the Pendulum Room, intending to show the full power even the lower class Saiyans used to possess. Mr. Popo and Kami come to the realization that Piccolo has become far less evil than he was five years ago, when they notice that Raditz's soul, who was killed by Piccolo, did not become lost like other souls killed by demons. Mr. Popo appears again in the Imperfect Cell Saga, bidding Kami a final farewell when Kami permanently fuses with Piccolo to become the Nameless Namek, in order to gain more power to combat the Androids who are wishing to murder Goku. When Buu escapes from the Hyperbolic Time Chamber, Mr. Popo and the rest are turned into chocolate and eaten. However, before he was turned into chocolate, after seeing the murders of Android 18 and her daughter, Popo bravely makes a quick decision, seizing Dende and hurling him off of the lookout, out of Buu's rampage. He is commended for his bravery by Piccolo, when the Namek comes across the surviving Dende.
Born from a woman who failed at dieting, the Diet Monster lactates a substance which makes women become hyper-obese. To accomplish her goals, she creates a pastry company and lactates onto all of the products.
She participated in Operation "Silver Wild Grapevine", where she played the role of the head of the air base. (Source: Wikipedia)