Olivi Thérèse is a fictional character from the visual novel 'Maitetsu.' She is a Rail Lord, a humanoid interface designed to assist with the operation of a specific train. Olivi serves as the Rail Lord for the locomotive 8620, which plays a significant role in the story. With her composed demeanor and strong sense of duty, Olivi is a central figure in the protagonist's journey to revitalize the town of Ohitoyo by reinstating its once-thriving railway system. Her interactions with other characters highlight her kindness and dedication.