Suiko Tatsunagi is a recurring character in Cardfight!! Vanguard (V Series Anime), and a tertiary antagonist during the second arc. She is a member of the pop idol group Ultra-Rare, and was sent to attend Fukuhara High School to spy on powerful cardfighters (notably Ren Suzugamori). She was forced into becoming a PSYqualia Zombie, and is the one responsible for turning Minami Kawanami and Asaka Narumi into Zombies. She is later freed by Kouji Ibuki, but her connection to Vanguard was severed in the process. Despite that, she continued to serve the Destiny Conductor. Due to her being a Called Walker, she will be erased from everyone's memories.
She has a serious yet caring demeanor. She treats Naoki Ishida as a child during their first encounter, and becomes sadistic while being a PSYqualia Zombie. After losing her connection to Vanguard, she becomes somewhat emotionless, continuing to serve Takuto Tatsunagi despite the events of the second arc.
Suiko has blue hair and blue eyes, often seen wearing the Ultra Rare uniform. In the High School arc, she wears the Fukuhara High School uniform.