Muu

Muu  is a minor character in Toaru Kagaku no Railgun. She is a Level 0 student of Academy City and is a user of the Level Upper.

Background
She is currently enrolled in Sakugawa Middle School and is a classmate of Saten Ruiko and Uiharu Kazari. She is usually seen with her friends Mako and Akemi, both of whom are also in the same class as her.

Appearance
She has dark-bluish hair which she ties into two pigtails. Her most notable feature is that she has the largest bust size amongst her group of friends.

Ability
She is a Level 0, and although she also used the Level Upper, her powers are as of yet unknown.

The Level Upper Incidents
In the anime, she first appears in class listening to a lecture about Personal Reality. She later appears alongside Mako and Akemi, wondering about the Level Upper and why she seemingly has never heard of it before. They then run into Saten Ruiko, who has obtained the Level Upper and shares it with them. She then uses the Level Upper, allowing her to improve her abilities, but she never demonstrates her newly-heightened power. Her next appearance is in a park, watching her friends practice their newfound abilities. Akemi forgets that she was using her abilities on Mako and drops her on the ground, making Muu worry about Mako. In the anime, she continues to watch her friends practice their powers when Akemi suddenly collapses, prompting her to run towards Akemi and aid her. She eventually also collapses as a result of using the Level Upper and is sent to a hospital.

She reappears in the anime alongside her friends in a special class for users of the Level Upper. Later, she joins the rest of the students in running laps around the track as part of training under Yomikawa Aiho. During Ruiko's confrontation with Elder Sister, Muu is concerned about Ruiko's well-being but doesn't do anything. After Elder Sister leaves, Muu-chan commends Ruiko for not backing down and comments that she saw sparks flying between her and Elder Sister. She agrees with Akemi's statement about Ruiko saying that cheating is wrong. After the special class, she tells her friends that her statistics rose a little but is dismayed that her Level is still 0. She later joins her friends for a party to celebrate.

The Poltergeist Incidents
She, alongside Mako and Muu, appear briefly in a flashback where they celebrate Kazari's induction into Judgment. Her final appearance in the anime is in a park somewhere alongside Mako and Muu, looking at Kiyama Harumi's birthday present that was prepared by her students.