For me, a character with a northern hat must have a heavy personality xD This is how I imagine Slippy's son

Marcus possesses telepathic abilities inherited from his mother, but the boy is a little weird in his way and he has a little tendency to make those people around him uncomfortable (not intentional).
So one day, Beto lost his patience

I have my own HC of these two characters.
Marcus has problems relating to others and prefers the company of machines, being the mechanic of the group.
Beto, Slippy's son, is more daredevil, and has the character of being a leader and sometimes he challenges Falco, who is the leader of Starfox.