Marin is a supporting character in Dragon Quest: The Adventure of Dai. She is a young woman of twenty years with dark brown hair worn in a ponytail and brown eyes. Her attire consists of a white vest, a blue cape known as the Divine dress, yellow gloves referred to as Guru's gloves, boots, and a gold circlet on her head called the Crown of clarity.

Marin is one of the three wise individuals of Papnica and the older sister of Aimi. Her magical abilities are centered on ice spells and recovery magic, and she is associated with the symbol of the sea. Her role in the story involves guarding Princess Leona, a duty she shares with her colleague Apollo. During an attack on Velge Island Tower by the enemy Flazzard, Marin and Apollo are present protecting the princess. Her background as a wise woman of Papnica and her specialized magic make her a capable defender, though she remains a secondary figure in the overall narrative.