Miki Koishikawa

Miki Koishikawa was a high school student at TokyoHigh School. She participated in their tennis team before going to college, where she joined a different team. She had a part-time job working at Bobson's, a ice shop.

Biography
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Personality and traits
Miki Koishikawa (小石川 光希 Koishikawa Miki) is a lively high school student, who is on the Toryo High School tennis team. She is cheerful, friendly, supportive, outspoken, a big girly girl and good-hearted. On the other hand, she can also be insecure, whiny, clingy, and very emotionally dependent on others. She had a part-time job working in an ice cream parlor called Bobson's. Later, she works in a small decoration shop.

Yuu Matsuura
Yuu and Miki started to fall in love with each other as they came to know each other better. However, Miki was very uncertain of herself and became jealous because Yuu was always surrounded by other girls, several of them being very beautiful and mature while Miki believes herself to be only average-looking and childish. She and Yuu eventually become a couple but doesn't tell their parents because they know their parents would annoy and tease them. They confessed their love to each other in episode 25, and started dating in episode 26. Due to Yuu being away in New York, and Miki tired of worrying all the time, she broke up with him in episode 62. But the two got back together in episode 71 when he returned for summer break. A misunderstanding causes Yuu to believe that they are half-siblings, and he breaks up with her without telling her the real reason, thinking the truth would be more painful. But after some time trying to make the right decision, they decide to marry and ask for their parents' approval. There, they learn that they are not related and receive their parents' blessing. By the end of the anime, they marry; at the end of the manga, they make plans to marry after college. In Marmalade Boy Little, after living together for 13 years, they get married and have two children named Fū and Kokona.

Ginta Suou
Ginta Suou (須王 銀太 Suō Ginta) is Miki's best male friend and a member of the Toryo tennis team. Miki has had a crush on him since junior high and confessed her feelings to Ginta in a note. However, the note was found by Ginta's classmates, and Ginta downplayed it, without knowing at the time that she was watching, although he felt the same way about Miki.

Although he did find out that Miki had witnessed his denial of any interest in her, he was unable to tell her how he really felt until high school. The romantic tension between them comes to a head with Yuu's appearance, which makes them realize that they still have feelings for each other. He decides to go along with Yuu's ex-girlfriend Arimi's proposal that they pose as a couple in order to drive a wedge between Miki and Yuu. In the process however, he starts to develop genuine feelings for Arimi, which she later reciprocates.

Meiko Akizuki
Meiko Akizuki (秋月 茗子 Akizuki Meiko) is Miki's best female friend. Meiko is the only child of wealthy parents and is very mature and beautiful. Meiko is always there for Miki and can always tell when the boys are being jealous. She is the first one to notice. Meiko is Miki's best friend since the seventh grade. Meiko is the more mature one out of the two and she is always there whenever Miki needs her. She is always giving Miki some advice when it comes to love life and family.

Kei Tsuchiya
Kei Tsuchiya (土屋 蛍 Tsuchiya Kei) is Miki's coworker at Bobson's ice cream parlor who is a talented but troubled pianist. He also falls in love with Miki, and tries to use Miki's lost medallion to cause Yuu to think Miki doesn't want him anymore. This fails however, as Yuu sees through his lies and, though he fights with Miki, they make up. Miki yells at Kei for his immaturity, and forgives him. After some convincing by Miki to regain his confidence in music, Kei quits his job at Bobson's ice cream parlor and says goodbye to Miki, promising to return soon. After Yuu and Miki broke up, they started dating but stopped when Yuu came home

Jin Koishikawa
Jin Koishikawa (小石川仁 Koishikawa Jin) is Miki's father and an accountant who works at a bank. He married Miki's mother Rumi after breaking up with his old girlfriend Chiyako and helping Rumi over her own break up with her boyfriend Youji. They moved to England and had Miki there, then returned to Japan. Later, he and Rumi reencounter Chiyako and Youji, reach an agreement, and swap spouses. Miki and her father are not seen that often together as much as she is with her stepfather.

Rumi Matsuura
Rumi Matsuura (松浦ルミ Matsuura Rumi) is Miki's mother, infamous for her bad cooking. She is cheerful and sweet, and like her ex-husband, a little childlike as well. She works at a cosmetics company. She was married to her old friend Jin Koishikawa, later divorced him on good terms, and married Youji Matsuura, her old flame.

Youji Matsuura
Youji Matsuura (松浦洋二 Matsuura Yōji ) is Miki's step father, who works at a trading company. He is mature and quick-witted, like his ex-wife and now best friend Chiyako. He is also good at math, yet horrible at video games. Initially marrying Chiyako after she was dumped by Jin to help support her baby, they remained together after her miscarriage and had Yuu. After divorcing Chiyako, he married Rumi. Miki and her stepfather get along well as seen in episode 2 when he helped her with her math homework that she struggled with.

Chiyako Koishikawa
Chiyako Koishikawa (小石川千代子 ''Koishikawa Chiyoko ) is Miki's step-mother, who is a very good cook. She works for a cosmetics company. She also gets along well with Miki, yet tries to not be pushy with her, which Miki appreciates a lot.

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Rikka Matsuura
Rikka is Miki’s younger half sister; they share the same mother. Rikka looks up to Miki and Miki is a typical older sister who loves her younger sister, and offers her encouragement.

Saku Koishikawa
Saku is Miki’s younger half-brother; they share the same father. Miki is a good older sister to Saku and often takes him and Rikka out to have fun.

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