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This article contains plot details from one or more of the books.
Jasper is a large brown male Dire wolf. He is mentioned to have a large, handsome face. He has half of a hind leg, and it has a stub with claws sticking out every which way. He most likely had green eyes, like the true wolves of the beyond. He either had a black or brown nose.
In Shadow Wolf it says he is the brother of Banja
When Faolan and Edme discover the MacHeath's plan to make a war between the bears and the watch wolves by stealing a bear cub, Jasper is shocked and angry, asking if they are sure. He discusses with the other watch wolves what they should do, and the plan is for Faolan and Edme to rescue the cub.