This is Jack! One of the two main protagonists in the 'Journey on' series.
Jack was found as a kid by his adoptive brother, and best mate, Montell's parents, who took him in and raised him as their own son along side Montell.
Although Jack is only a human, Montell's family are shape shifters making growing up with them trickier than normel, but Jack never shows any jealousy.
Jack wears a red and white rugby shirt, as it was found with him and he presumes it was his father's.
