Johnathan Saturday is the son of Sarah Hollinger and Zak Saturday, the brother of Jasmine Saturday, a character in The Gift of a Best Friend, and was only seen as visions in Zak Saturday's Immortal Love Life. He made his first appearance in I Guess Not Everything Has Changed.
- I Guess Not Everything Has Changed
- We Make Best Friendship Bracelets For Each Other (mentioned)
- My Brother is Born
- I Learn What I Can Do With My Powers
- I Can’t Read (mentioned)
- My Family Comes to Camp Half-Blood
- We Build a Grounded Treehouse (mentioned)
- The Frozen River
- I Almost Get a New Uncle, Part 2
- I Get an Unexpected Surprise
- He was born in My Brother is Born.