Takatsuki Shiori
From UtenaWiki
Shiori Takatsuki ' (高槻 枝織)Shiori is the catalyst for Juri's current broken state of mind. She simultaneously idolizes Juri for her brilliance and despises her for it. Her extreme lack of self-worth is the reason for the rocky relationship between the two, and it reaches a breaking point when Ruka re-enters Ohtori academy.
Background
Anime
Juri's childhood friend, Shiori left the school after stealing the man she believed to be Juri's boyfriend in order to feel more powerful than her, leaving Juri devastated. Contrary to Shiori's initial beliefs, however, Juri is hurt because Shiori is the one she was in love with. Shiori is in some ways an innocent character, in denial of her true feelings of admiration for Juri. Due to her inferiority complex, her attitude towards Juri is often downright sadistic (as her schemes are often designed to hurt Juri for no reason other than to see her suffer) and at the same time masochistic (as Shiori hurts herself every time she hurts Juri). Upon discovering Juri's love for her, Shiori becomes a Black Rose Duelist and pulls her dueling sword from Juri.
Movie
In the movie, her role as an antagonist becomes much greater by manipulating Juri into dueling Utena. She is also shown as having been in love with Touga and therefore considers both Utena and Juri to be rivals for his affections. She also is a very horrid obstacle in Utena's path. In the end she attempts to thwart Utena's role in becoming a prince, as she believes Utena is the main reason Touga does not love her the way she wants him to.

