Lassen is the 22-year-old son of the Sakif tribe's chief, who is supposed to marry a user, one of the mythical creatures known as the Maketth. He was not forced to do this; it was entirely his choice, as he wanted to protect his tribe. Lassen is a responsible and calm individual, but he also has a sense of humor, often smiling and trying to cheer up the tribe during difficult times. Even though he is not yet the chief, he is dedicated to ensuring the tribe's prosperity. 