Kaka and Sisi are brother and sister. Kaka and Sisi are the names of the characters in the TV series The Walking Dead. Xixi and Kaka joined Locke's club with their father Ryan in the early days, and later their father died unexpectedly. There are only two children left, Sisi is kind-natured, while Kaka is eccentric and likes to kill zombies and feed them, which later killed his sister Sisi. Bite yourself to death.