Nao

Nao (ナオ), called Nao-kun (ナオくん) by his friends, is a young esper of yet-unknown Level introduced in Toaru Kagaku no Railgun whose ability is Electromaster. He is friends with Hazamaya Kana.

Appearance
He has light-colored hair and blue eyes.

Sisters Arc
He and his friends play with Misaka Mikoto, who has nothing to do all afternoon. After one of their friends comments on how he will become a Level 5 to challenge her, Kana gets Mikoto's attention and tells her of Nao's powers. Nao shows it off, and is only capable of creating a small spark if he concentrates, to which Mikoto says that everyone is like that in the beginning.

Kana then entertains the idea that if he was more powerful, Mikoto could communicate with Nao like a "Radio". Mikoto initially scoffs at the idea, as there are too many interference in the city, but then ponders that it could be possible if there was a brainwave network like that of the Level Upper previously set up by Kiyama Harumi. After exhausting all capsules in a gachapon machine just to get a Gekota badge, Mikoto sticks several badges on Nao and his friends. Mikoto later leaves them as she senses a power that is incredibly similar to hers, which leads to her discovery of Misaka 9982.