Loose! Roose!!

"Phantom Thief Roose" - Few people know his height, weight, age, and appearance. The only thing known about him is that he is a thief who is very loose with time! Even if I sent the standard notice of a phantom thief... he never showed up on time. It's normal for someone to be late, and sometimes they show up two or three days later, and sometimes a notice arrives after they show up to steal. A terrifying phantom thief whose movements are unpredictable...that is phantom thief Roose!! What kind of person is phantom thief Roose?