Bakemonogatari: Tsukihi Araragi

Tsukihi, the main character of Tsukihi Phoenix, is one of Koyomi's sisters. She's the youngest of Araragi family. Unlike her sister, Karen, she is always doing indoor activities. Contrary to her personality, she constantly changes her hair style and is short-tempered to the point that Koyomi describes her as having hysteria.