Nina is a classmate of Ayu. When Ayu first met her, she had lost her "magic computer," and as it turns out, Nina actually comes from another world called the Magic Kingdom! Nina is in fact, a magician, and with the help of her little computer, she can put enchantments on things and people. Although her intentions are usually very good, the results aren't all that magnificent... Nina is currently studying aboard at Ayu's school and lives with a host family (mix of magic and normal human marriage). Nina also has a cat pet, Rio, who can be turned into human form when taking a magic pill. Nina admires Ayu a lot and will do anything to try help her! Nina is also the first one to discover Kaji's true personality. She also likes to refer to herself in the third-person.
Height: 162 cm The popular girl at school who makes friends with the new student at school, Nina, who is a magic girl. Ayu doesn't believe in magic or anything like that, she has to keep her cool to maintain her reputation. She loves to play tennis and has a huge crush on Tetsushi.
Born Jan 12, 2144 Planet Pizanne, The Cygnus Zone - Alfin was the Princess of the Planet Pizanne who left her home and royal status to join the Crushers. After the Pizanne incident she sneaks aboard the Minerva and takes the late Gambino's place as navigator. Perky, bubbly and easily intoxicated, Alfin is also quick-witted and fearless. She and Joe are romantically involved.
Born November 8, 2142 Planet Aramis, The Canis Major Zone - Joe is the headstrong leader of his Crusher Team, Joe became a Crusher at the age of ten and replaced his father as the active head of the Crushers. Now nineteen, he maintains his Triple A rating. Joe has an intensive dislike for authority (other than his own) and refuses to take orders from anyone, including his father. However, he does have a lighter side, which enables him to take the balance of a situation and to act quickly and calmly. He and Alfin are romantically involved.(From Wikipedia)
Kaji is in the same grade as Ayu and Nina, and is also the school idol. He is considered cool and always has a nice smile. All his fans are constantly giving him presents, and he even has admirers from the 3rd grade. However, this is only his outer mask. Kaji is in reality a normal guy who hates being given presents by people he doesn't know. But he is working hard on his "nice person" persona because the girl he likes, Ayu, once told him that's the way she liked him. He becomes closer to Nina after she discovers his deception. He is an introverted person, and doesn't like giving away his real feelings or thoughts. Kaji belongs to the school's baseball club. His best friend is Tsujiai.
Tsujiai is a classmate of Kaji, Ayu and Nina. He is the head of the male tennis club and is a slightly extravagant person. Ayu seems to hate him because at the start, he always managed to destroy her chances with Kaji one way or another. Tsujiai introduces Nina to Doraemon (which she loves). His best friend is Kaji and he likes Nina which is shown more in the manga than in the anime. He has a cat name Shinnosuke and is the third person to know that Nina was a magic girl because he saw that Rio the cat transforms into a human.
Tsukushi Makino is the main female character, and is one of the very few students at the prestigious Eitoku University to come from an "unwealthy" family. Her family is so poor that they can barely afford to pay Makino's tuition, but her parents push her on to continue school because they have a dream that she can "snag a rich man" and take them out of poverty. At the beginning of the manga, Makino was a poor, pig-tailed girl who had almost no friends at school and kept to herself. When one of her only friends falls down a staircase and bumps in the leader of the F4, Makino stands up for her friend (Domyoji was about to hurt her for bumping into him) and suffers the consequences. The next day, a red tag is hanging in her locker, which predicts future torment from the F4 and followers. But, unlike most of the F4's targets, Makino stands up for herself, showing how strong a "weed" can be. In this process, she changes to let her stubborn, hardworking ways show through, and in the end she turns all of the F4 into her friends. At first, Makino hates all of the F4 except Hanazawa Rui, (which she has romantic feelings towards). But, as Rui goes off to chase after Shizuka, Makino gets to know them, and even slowly falls in love with the hotheaded leader, Domyoji.