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)
Midori is the mother of Kei Takishima, and they're very alike. She's always away on business trips, but cares for Kei a lot. When she meets Hikari she wants Hikari to ask a lot of things for her, so she can spoil her like a daughter. Hikari notices that she actually wants Kei to ask things from her but he never did. The chairman of the Takishima company is the father of Midori.
A gym teacher at the girls' school. In the girls' first year of high school, she is the homeroom teacher of Class 5. During their last two years, she is the homeroom teacher of Class 2. An old high school friend and rival of Yukari, they have a juvenile, exasperating, but funny relationship with each other; Yukari relentlessly insults and freeloads from Nyamo, but Nyamo gets her digs in, too. "Nyamo" is a nickname from her student days, but Yukari calls her that, and so does Tomo. Other students call her Kurosawa-sensei. Whereas Yukari appears to be an older version of Tomo, Nyamo resembles Yomi (more in personality than looks) and the two teachers' odd relationship is similar to the one that Tomo and Yomi share. Popular with the students, Nyamo is nicer, less obnoxious, and far more in control than Yukari. Yukari often teases her about her past romantic relationships and that she is a "stupid P.E. teacher." During one of the summer trips the girls take together, Nyamo gets very drunk (usually, Yukari is prone to this behaviour; as a matter of fact, Nyamo drank specifically to keep the alcohol away from Yukari) and tells the girls all about the birds and the bees, which embarrasses Sakaki and confuses Chiyo, but impresses the other girls. In addition to teaching her homeroom class and P.E., Nyamo is the coach/advisor of the women's swim team. Kagura calls her "Coach" and holds her in very high regard. The fact that students tend to come to her with their problems is yet another source of Yukari's jealousy, as well as the fact that she is generally more "together" and better-disciplined. Unlike Yukari, Nyamo is able to maintain an apartment of her own. She also owns and drives a blue Toyota Vitz 5-door. She is very sensitive to comments about her love life, which has evidently provided Yukari with an endless supply of blackmail material and points at which to rib her. One of these apparently involves a "love letter" from high school, which Yukari loves to dangle over her head. Still, she is quite devoted to teaching and at one point turns down a job offer that would have given her far greater income and prestige. (Source: Wikipedia)
Leader of the four Golden Delmos. She's charged with the assassination of Aika but she fails both times. It's unclear if she survives in the last episode.
Kei's grandfather, Kaname Takishima, is the head of the Takishima group and is a powerful man in a business world. However, he is rarely seen by others, including his own family members. He makes his first appearance in chapter 25, when he makes a phone call to Kei's father. When Hikari speaks with him over the phone, he plants the idea in her head that Kei is burdened by her very presence. She meets him face to face in Chapter 59, when President Takishima tries to convince Hikari to transfer schools. He disapproves of Kei's relationship with Hikari and makes many attempts to separate them, such as sending Aoi, arranging marriage meetings for Hikari in London, and arranging a marriage between Kei and a girl named Alisa. The President expresses a strong dislike of Hikari and the mere sight of her sickens him. It is eventually revealed that he feels that he and Hikari share similarities that will make the people they love suffer; as a result, he fears that if Kei remains with Hikari, he will endure the same fate as his grandfather did. (Source: Wikipedia)
She is Aika's salvaging partner and her Boss' daughter. Her mother divorced after she was born. She wants to run the business better, but her father keeps to his policies. She does not like being left out of transactions nor having Aika do the work herself. Rion looks upon Aika like her real sister and yearns to become like Aika. (Source: Wikipedia)