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.
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.
Shu is the owner of the shadow Blue Dragon, which often uses magic sword attacks. In the anime, Blue Dragon at first doesn't cooperate with Shu until their fight with Ivanov and Gustav when Shu managed to gain enough power to control him. For most of the anime, he is quite insulting towards him and constantly criticizes everything Shu does. The Blue Dragon is in fact depicted as having very violent personality, and is extremely cold, not caring about anything or anyone but himself. (Source: Wikipedia)
Blue is a transgendered mercenary of an evil crime boss. He/she likes to wear red clothing, in contrary to their name. Like his/her boss, he/she is a ruthless outlaw, who does anything and everything they want, stepping on others without any hesitation. Despite this, it is shown that the boss cares about Blue deeply.