Muru is a field mouse. He is very small, only a little larger than Aleu's paw. He has light brown fur covering most of his body, with pink paws, tail and inner ears. Like most cartoon mice, Muru has two buck teeth. His eyes are black, yet they have a calm and gentle look to them. Muru is very nimble; he is seen adjusting crystals by carrying them around and jumping across them.