Sebastian is known as a cold loner to those who don't know him. He is always recognized with his deep purple hoodie and his dark, side-swept hair. His mother is Robin, the town's carpenter. He lives in the basement of his mother's house, located in 'The Mountains' of Pelican Town. Sebastian is Robin's son by birth, but Robin is married to another character, known as Demetrius, who is his step-father.