Mr. and Mrs. Burke: Leslie’s parents are both writers: her father specializes in political writing and her mother writes novels. They are fairly successful and are caring parents, though at times they become absorbed in their work and neglectful of Leslie. Still, their creative approach to life and easy affection with one another is appealing to Jess, who sees them as the kind of family he wishes he had.
Mrs. Aarons: Jess’s mother cares for the family’s house and her five children, and is as tired and stressed by their financial situation as her husband is. She is also subject to similar bouts of temper. Like her husband she appears to care about her children, but has little interaction with Jess except to nag him about chores.
Ellie and Brenda Aarons: These are Jess’s older sisters, around sixteen and fourteen respectively. They are both portrayed as spoiled and selfish, not helping their mother as much as they should and absorbed in consumerism and popular culture. Both are very self-absorbed, and they constantly bicker with each other and annoy Jess. Ellie is the more sophisticated of the two, better able to get out of chores and convince their mother to give her money the family can’t afford to waste.
Joyce Ann Aarons: Joyce Ann is four, and is Jess’s youngest sister. She is the baby of the family, and portrayed as little more than whiney and annoying. She is too young for any of her siblings, even May Belle, to pay her much attention, and she does not seem to have the same affection for Jess that May Belle has.
Mrs. Myers: Jess and Leslie’s fifth-grade teacher, Mrs. Myers is portrayed at first as a stereotypically harsh teacher, a disciplinarian who is given the nickname “Monster Mouth Myers." She is one of the few at school who appreciates Leslie, though, seeing her as a model student. And near the end of the novel she is revealed to have a human past and emotions, in much the same way Janice Avery is shown to be more than a simple bully.
Prince Terrien: Prince Terrien is the puppy Jess gives Leslie for Christmas, a perfect gift that helps cement their friendship. He accompanies Jess and Leslie on many of their excursions to Terabithia, and plays various roles in their imaginary games.