Xavier is one of three impostors. He is cold, serious, and strategic, and tends to stalk his targets first. He rarely runs. He is occasionally humorous or grumpy. He is the "security guard" of the crew. He growls when she's angry or hunting and behaves like an animal. When he's not hunting, she is casual and inexpressive, but awkward around Chara. He likes to solve Rubix cubes in his free times, and carries multiple different types of cubes. He has a slight Russian accent.