Not much background is given on Aaron. His mother works at the local bus station's luncheonette. He attends school with Marianna Jekyll and has a cousin, Allan, who's on the police force.
While Heidi Davidson waits at a bus stop, Aaron befriends her. Aaron warns Heidi of a creature that terrorizes the town. He says that her uncle may in fact be the monster.
Aaron Freidus is described as having thick, dark, brown hair. Heidi also describes Aaron as being cute and roughly the same age as her.
Aaron proves himself to be fairly brave near the end of the story.
- There is another Goosebumps Series 2000 character named Aaron Freidus in the book The Werewolf in the Living Room, but the characters are in no way related.
- The boy named Aaron in Jekyll and Heidi has a mother, while the Aaron in The Werewolf in the Living Room does not.
- The Aaron in Jekyll and Heidi also has dark brown hair, while the Aaron in The Werewolf in the Living Room has red hair.