He wears two brown wristbands, a baggy white t-shirt, a sleeveless orange vest with three pins: a golden star, a small blue button, and the Mystery Skulls' logo. He also wears baggy yellow pants and brown hi-top sneakers.
Arthur was a paranormal investigator of Mystery Skulls with his friends Vivi and Lewis, who were in a relationship at the time.
Arthur works at his repair shop and is thus not only his nephew but also his employee.
Arthur is assumed to be the most skittish of the group