Mikoto developed a fixation on Touma because of his mysterious ability to negate her powers, driving her to chase him around for a rematch. Kamijou Touma also coined the nickname Biri-Biri (a Japanese onomatopoeia imitating the sound of electricity) for her, a nickname that greatly irritates her.
She is the third-ranked Level 5 esper and the strongest Electromaster in Academy City, nicknamed the Railgun due to her signature move. Misaka Mikoto is a main heroine in Toaru Majutsu no Index and the main protagonist of Toaru Kagaku no Railgun.
