Colin James Finn, seen in Exchanges, is a young maned gryphon cub with light-blue eyes and tailtip. He is the youngest of the Finn brothers (the others being Paul, Jim, and Tobias) and recently received his medallion. He is hyper and mischevious and very much wants to accompany Jim to America.

Colin's human form has curly light blue hair, implying that like he has the curse. Colin's midform has not yet been shown.

Colin seems to have inherited the coat color of Mary, his mother, and the beak shape of James, his father. He is almost ten years old.