Melvin

Melvin is the name of the Once-ler's pet brown and white mule, as he accompanied him on his journey to find the material for his Thneed.

Personality
Melvin is shown to e loyal to his owner as the mule pulled his curt, woke him up when they came across the Truffula Forest, staying and sleeping outside the Once-ler's house-like-tent without a rain - that would be tide to a tree or peg - to keep him from wondering off, "asking" The Lorax and the other animals what they are doing to his two legged friend - before the guardian of the forest fed him a Truffula fruit - and accompanying the Once-ler to and from the small town next to the forest and wearing a sigh on his back, when the Once-ler tried to sell his Thneed.

But after the last of the Truffula Trees were cut and turning the destroyed forest into a wasteland, he joined the homeless animals as they left their once beautiful home and went to look for another place that they could call home, leaving his "former owner" and friend behind and alone in the land that his greed had destroyed.