The Sprinter

Miwako Mizumi earned a small degree of celebrity in her teenage years as the world kendo champion across all age brackets. In college, she moved from kendo to aikido—an unarmed style which stresses nonviolence. During those years, she also became part of the superhero fan culture of Tokyo and especially admired the British speedster Crimson Comet. While getting her Ph.D. in neuropsychology, she volunteered for an experimental performance enhancing surgery that resulted in her gaining exceptional—if barely superhuman—running speed. When she realized she could pair this with her martial arts training, she decided to fight crime and become a hero like her idol. A smart and skilled fighter, she has survived a few years on the streets and begun to accumulate a fan following of her own.
Tokyo is not known to be teeming with street crime, so Sprinter spends much of her time stopping fights and helping drunks stagger home safely. She has recently begun investigating the Yakuza, however, so her life is more interesting and dangerous than ever before.