Selby is a dark skinned man with short black hair and a black moustache.
In his debute scene, Selby has been send to Edmund Ahlberg Elementary School to show Enid Hallgrim's class a safety video about the dangers of Trolls. The video greatly exaggerates how dangerous trolls really are, which Frida and David point out, resulting a heated discussion between the students that culminates in Frida leading a walkout in protest.
In the climax of the movie, he is seen among the other Safety Patrol officers as they prepare themselves to fight off the invading army of Trolls. Erik Ahlberg takes Selby's hat for himself, having lost his own earlier. His final scene is during the award ceremony where Erik Ahlberg is given a medal.