Evan Pettiwhisker Tildrum is a fictional character from the children's book series titled The Last Unicorn by Peter S. Beagle. He is a small, timid creature known as a mouse who serves as a companion to the main character, the Unicorn. Evan is characterized by his gentle nature and his desire to help others, despite his fears. In the story, Evan's loyalty and bravery shine through as he faces various challenges alongside the Unicorn. His interactions with other characters highlight themes of friendship and courage, making him a memorable part of the narrative. Evan's unique personality adds depth to the enchanting world created by Beagle.