Yoko is a young woman from Jeeha's neighboring village of Ritona in the Anime/Manga Tengen Toppa Gurren Lagann. She had been tracking the Gunmen, which subsequently crashed through the surface and into Jeeha. She wields an extensive arsenal of weapons and has substantial experience fighting the enemy. She uses her outstanding soldiering skills and wise counsel to advance the war of liberation. She wears short shorts and a bikini top: as she states in episode 5, she avoids clothing which restricts her movement in combat situations. She loves children and has a dream to become an elementary school teacher.
A spin-off manga entitled Tengen Toppa Gurren Lagann: Gurren Gakuen-hen (天元突破グレンラガン −紅蓮学園篇− ?) started serialization in Comp Ace on August 26, 2008. The manga takes the characters from the original story and puts them in a school in a parallel world. In the manga, Simon attends Dai-Gurren Academy (ダイグレン学園 ,Dai Guren Gakuen?) with his friend Kamina, and childhood friend Yoko. Simon, who lives in a run down apartment building, wishes for a normal life, and meets the mysterious Nia one day when she trips down the stairs. She immediately takes a liking to Simon and declares him her husband. Kamina finds another "aniki" in Nia, who shares his hot-blooded style. She enrolls in Dai-Gurren Academy, and all three must deal with the threat of students from Teppelin Academy, who wish to bring Nia back to her father, the principal.