Protagonist of the spinoff manga Toaru Kagaku no Railgun.
- Misaka Imouto: Looks about the same but usually has a head mounted display. Also, while Mikoto has shorts on under her skirt, this one only has striped panties.
- Dolly: Looks about the same but usually has long hair.
- Last Order: Much younger looking than the other two and the only one with an ahoge.
- Misaka Worst: Looks slightly aged up and wears a gray and white bodysuit or a Vietnamese dress.
- Misaka Misuzu: Mikoto's mother. Looks very young for her age (just slightly older than Misaka Worst) and has large breasts.