Mask

Mask, also known as Riverwyte, was a male otter, and the brother of Bargud and Warthorn (the Skipper of The Legend of Luke), uncle of Folgrim and Tungro, and brother-in-law of Garraway Bullow. Although his real name is Riverwyte, Mask is nicknamed as such due to his amazing talent of imitating the appearance of other creatures. He used this gift to disguise himself as a fox, Patchcoat, in order to infiltrate Kotir and rescue Gingevere, Ferdy and Coggs. He was a warrior until his tail was cut off by vermin; he then retired to a relatively peaceful life in Mossflower Woods.

He had greyish fur and pale eyes, and lived in a hollow log in the forest. After his daring episode in Kotir, he was struck by an arrow meant for Gingevere from Tsarmina's bow, which killed him. He was then buried at Camp Willow, home of the otters.