Alex was afraid of the dentist, like Chase, in "Pups Save a Toof." Their fears were resolved in the same episode.
He is the first human character to ride in a PAW Patrol vehicle (Marshall's firetruck).
In "Pups Pit Crew", Alex builds a box car racer out of duct tape and old restaurant stuff which he calls his "Super Trike". The PAW Patrol and Ryder help Alex rebuild it after it breaks apart. In "Pups Great Race", he uses it in the race against the PAW Patrol and ultimately manages to win the race (though to be fair the pups had to leave during race to save Mayor Goodway and Chickaletta).
When riding his Super-Trike or participating in activities like snowboarding Alex wears a yellow helmet that resembles a duckling (or baby chick).