Yōko Igarashi (五十嵐 陽子, Igarashi Yōko) is a member of The Valkyries who uses twin tri-bladed sai.
Yōko has dark grayish-blue hair that is tied in a long ponytail with a white bandanna.
- The name Yōko means "light, sun, male" (陽) (yō) and "child" (子) (ko).
- Yōko's surname Igarashi means "fifty" (五十) (iga) and "storm, tempest" (嵐) (rashi).
- History's Strongest Disciple Kenichi Official Guidebook.