Seishirou Sakurazukamori is a fictional character from the manga and anime series X/1999, created by CLAMP. He is known for his calm demeanor and exceptional skills as a sorcerer, specializing in the manipulation of life and death. Seishirou is often portrayed as a complex character with a mysterious past and a deep connection to the series' themes of fate and sacrifice. In the story, Seishirou serves as an antagonist, often clashing with the protagonist, Kamui Shirou. His character is marked by a duality, as he embodies both charm and danger. Seishirou's relationships with other characters, particularly his bond with Sakura Kinomoto, add layers to his personality and motivations throughout the series.