Shokuhou Misaki

The "Queen of Tokiwadai" is a mysterious Level 5 Tokiwadai student that goes under the alias "The Queen". Her ability is Mental Out, a very powerful ability involving the human mind which includes reading other people's memories, changing a person's personality by means of brainwashing, telepathy, memory elimination, amplification of will, reproduction of thought, and transplantation of emotions, all of which require her to touch her target. As one of the two Level 5s of Tokiwadai, she and her followers have a rivalry with Mikoto and her fans. She never shows herself in public, instead using her followers or mind-controlling people to act as her representatives when talking with individuals. It is hinted that she has a strong dislike for public appearances, and this is why whenever the school needs a "face" to promote certain public events she and her faction will simply stand aside and let Misaka Mikoto hog all of the attention and responsibilities.

Misaka Mikoto is the one that mentioned her for the first time, noticing how she is the best mind controller within Academy City. Mikoto first consider asking her to fix Kamijou Touma's memory loss problem, however she quickly dismissed the idea since she isn't in good enough terms with the Queen, and asking her for help would be to trust the health of a friend to someone she has an indirect rivalry with.