Tōko Murasame is a Zweilt guardian of the Giou clan, excelling at offensive combat. She possesses ash-bronze waist-length hair and golden eyes, traits common among Zweilt. She attends high school with her younger brother, Tsukumo Murasame; their exceptionally close bond, carrying subtle romantic undertones evident in actions like sharing a bed and Tsukumo's open declarations of love which embarrass her, stirs jealousy among classmates yet underscores their deep devotion. Her personality blends cheerfulness, empathy, and assertiveness. She readily offers hugs and kind words to comfort others but displays a fierce, snarky demeanor when confronting injustice or anger. This duality shapes her interactions: she frequently argues with Hotsuma Renjou due to clashing personalities but maintains a functional combat partnership. She shows particular protectiveness towards Yuki Giou, whom she calls "Yuki-chan," citing his excessive kindness as a weakness, and insists he call her "Tōko-chan" to reinforce closeness. In battle, Tōko's ring transforms into the large sword Eon (Eternity). As a bearer of the "Ears of God," she wields enhanced hearing and telepathy, though these abilities are less developed than her brother's. Her primary duty is physical confrontation against supernatural Duras threats. Key relationships drive her development. Interactions with Luka Crosszeria involve blushing and initial awkwardness, later revealed to stem from his resemblance to a lover from her past life; despite this, she actively supports Luka's relationship with Yuki. During a school trip with Shuusei Usui, she humorously confronts rumors about them being a couple, demonstrating her adaptability. Her dynamic with Hotsuma evolves from frequent clashes to mutual respect, reflecting her ability to navigate complex alliances. A spin-off manga details her childhood with Tsukumo, exploring early challenges and their lifelong reliance within the Giou clan's duties. Her surname "Murasame," meaning "rainfall that suddenly starts and stops," symbolizes her abrupt emotional shifts between warmth and intensity. Her birthday is March 22.