Red is an Efrafan buck who worked for General Woundwort. His partners are Vervain, Campion, Moss, Gorse, Thistle and presumably Shale, as presumed by fans who believe that the greyish blueish Efrafan appearing in seasons 1 and 2 is a prototype version of Shale.
He only has two lines in two episodes, Escape From Efrafa and The Stand. In "Escape From Efrafa" when Vervain asks him if there's any sign of Kehaar he says no, and in "The Stand" when the twins try to escape, the dark white one drops some rocks down to Efrafa and when Red notices the twins escaping he screams a warning. When he explores Cowslip's warren he wanders into a bush and screams "CAAH", meaning he most probably got caught in a snare. However, in The Great Game he is seen with Moss stopping Vervain from attacking Campion. He is also seen in first episode of season 3 where he is left homeless after the battle in Efrafa.