Grayson serves as a knowledgeable and clever member of Rusty's (originally Yoisho) sailor mice crew, instantly recognizable by his distinctive large glasses and notably short tail. He shares a history with Rusty as one of his childhood friends. Grayson joins Gavin (Gamba) and Matthew (Mampuku) on their journey to Dream Island. Within the crew, he actively contributes his intelligence and sharp observational skills to group strategies and decisions during their mission: defending Chester's (Chuuta) family and the mouse inhabitants of Dream Island against Winston (Noroi) and his antagonistic weasel clan. His interactions consistently demonstrate camaraderie and mutual reliance as a supporting member of the central group focused on this collective goal.