Tiche Yaiba is a fictional character that does not canonically exist in the Elden Ring universe. While Elden Ring features a character named Black Knife Tiche, there is no character officially known as Kuroki Yaiba Tiche. In the context of fan works or creative reinterpretations, Tiche Yaiba could be imagined as a skilled assassin or spirit associated with the Black Knives, playing a significant role in the game's lore involving betrayal and the Night of the Black Knives.