Sunspot is an elf police officer who, after Alderman’s party, becomes a private security guard along with his partner Wildflower.
He and Wildflower spot Hearthstone and Magnus Chase as they wonder through Alfheim. They recognize Hearth and take him and Magnus to his father. When they learn Magnus is a son of Frey the two became apologetic.
Later they are called in when a disturbance in the Alderman house is reported and try to stop Magnus, Hearth and Blitz from leaving, however Jack slices their pants and they fall down.
After the event, the two either resigned or were fired and eventually came to work at a private security company.
Speaking of Trolls...
As he and Wildflower stand watch over an estate, they see Hearthstone approach and he quickly gets by them. They then call in Siersgrunnr, but the troll is soon bested by the deaf sorcerer and run as far away from him as possible.