Matilda Caskett

Matilda is Roll's mother who disappeared years ago on Forbidden Island. She was seen at Von Bluecher's press conference onboard the Sulphur-Bottom. Yuna found her on Forbidden Island, and in order for Yuna to save Matilda, Yuna had to take control over her body. During the game, Yuna never actually leaves Matilda's body, and Roll's mother never does speak with Roll or other characters at all. It is this event that makes Roll and Megaman start their adventure to find Roll's mother. At the end of the game, Yuna still resides within Matilda's body while Sera resides in her original body while trapped in Elysium with Megaman. It is unclear whether or not Yuna does leave Matilda's body after the events of the game.