Ivy Claire Katz (born May 7, 1994) is a 15-year-old demigod daughter of Hermes.
Ivy was taught to hate her father for leaving Claire. She does, even though she has never known him.
One day, Ivy was at home with Amber Mizrachi (Hannah's daughter) when Hannah was killed. After burying the dead woman, the girls fled.
They stole a car and checked into a motel for the night. The next morning, Ivy was claimed by Hermes. Amber, however, remains unclaimed as of the latest chapter.
After a satyr named Serenity takes Amber and Ivy to Camp Half-Blood, Ivy goes out into the forest and meets Luke.
Ivy is a beautiful girl. She has long dark brown hair, warm brown eyes, and very pale skin like her father's. She does have flaws, though - like too-big eyes, a nose that is quite small, and big feet. Ivy also has slight acne, like most teenage girls. She is short for her age at 5'0 (not much taller than eleven-year-old Amber) and she weighs around 105 pounds. She is flat-chested. Ivy is described as looking a lot like Claire.
Ivy is tomboyish and despises girly things (the only reason she watched Gossip Girl is because Amber likes it). She is a little hot-headed, but doesn't let her emotions show very much. She is afraid of the dark and the color red. She is a bit of a kleptomaniac. Like most half-bloods, Ivy has ADD, so she is impulsive and fidgety. She also has dyslexia, so she hates reading, preferring to spend her time shoplifting and playing video games. She is very aloof and reclusive, but eventually warms up if you're nice. Ivy loves country music and her favorite color is black. She is emotionally disturbed and loves dark, revealing clothes. In other words, she's emo. Other than her kleptomania, she doesn't really act like a child of Hermes.
- Claire Katz (Mother, deceased)
- Hannah Mizrachi (Godmother, deceased)
- Amber Mizrachi (Adopted sister)
- Hermes (Father)
- Luke Castellan, Travis Stoll, Connor Stoll (Half-brothers)
- Other determined members of the Hermes cabin (Half-siblings)
- Ivy's theme songs are Viva La Gloria (Little Girl) by Green Day, Concrete Angel by Martina McBride, and Stand In The Rain by Superchick.
- Ivy's personality is a LOT like that of her creator, Sparrowsong.