Madeline "Maddie" Fenton is an accomplished ninth-degree martial artist who serves as Jack's partner and equal inventor of Fenton anti-ghost gadgets. She is more down-to-earth than her husband and often supports or keep her husband from getting into trouble or harm. She is often the more sensible of the two. Vlad Masters has been in love with her for twenty years ever since college and has spent time trying to win her heart, developing his obsession for her by programming a Maddie hologram to shower praises on him.
Maddie appears as a NPC in Nicktoons Unite! She was captured along with her husband Jack by Vlad Plasmius. Eventually the heroes came to save them and defeated Vlad, but they could escape before Jack and Maddie came to consious.
Nicktoons: Toons WarsEditMaddie appears along with Jack as an assist trophy in Nicktoons: Toons Wars.
When she is summoned she and Jack will start to attack the opponents with their ectoplasmic energy weapons. Maddie will use a small shotgun and rapidly shoots while Jack shoots with a bazooka-like weapon.