Maddie has shoulder-length auburn hair, deep red lipstick, and violet eyes. She usually is always seen wearing a blue rubber jumpsuit, along with black rubber gloves and boots. Her suit also has a belt, which has a pouch for her equipment, and a rubber hood, which she usually wears, along with a pair of black lab goggles with red lenses.
Maddie is a firm believer in what can be strongly evidenced or scientifically "proven" (in the Danny Phantom universe, that includes ghosts) and is more rational than her husband, who is now an alcoholic. She is very protective of her family which she loves very much, defending Jack whenever Vlad speaks ill of him.
While she has shown to be overly enthusiastic with Ghosts like her husband, Maddie has shown she can restrain herself better.
- Martial Arts- Maddie is a ninth degree black belt in martial arts (what kind of martial arts is unknown).
- High Intelligence-Maddie is considered a technical genius, creating most Fenton devices , which often help her son in his adventures.
- Ghost Technology- Maddie also has various kinds of Fenton Tech, each of them having a specific use in fighting ghosts.
- Inventive Skill- Maddie has made numerous pieces of Fenton Tech, with varying levels of complexity and use.
- Human Weaknesses- Maddie Fenton is a human, so she shares the same weaknesses that most humans have.
Prior to 5 Years Later, Maddie was a ghost hunter along with her husband, Jack Fenton. Not much of Maddie's past is revealed outside of her college days, where she was friends with Vlad Masters and Jack. The three worked on a Porto-Ghost Portal that backfired and resulted in Vlad getting Ecto-Acne. Afterwards, Jack married Maddie and they had two children: Jazz and Danny Fenton.
- In Chapter 1: Alienated (Page 1), Maddie appeared in a flashback alongside her husband Jack.
- In Chapter 8: Risen (Page 35), Maddie appears in a photo found in a flashback.
- In Chapter 9: Time Out (Page 35) Maddie, Jack Fenton, Jazz Fenton, Tucker Foley and Sam Manson all appeared in a brief flashback Danny had before going through his Awakened Form.
5 Years Later
- Chapter 1: Alienated (first appearance; cameo/flashback)
- Chapter 2: The Lonely Ghost (Photo)
- Chapter 8: Risen (Photo/flashback)
- Chapter 9: Time Out (Cameo)
- Maddie has known both Jack and Vlad since college, and during that time had been unaware of Vlad's feelings for her.
- Maddie's middle and birth name, Holly Payne, are a reference to Holly Payne, creator of the #GoGhostAgain Movement, popularized by the fans.