Fiona Diaz (born 1985) is a former supporting character in the Tucker's Wand and Tales from the Tuckerverse series. She is now a Spydoll in the Spydoll Inc (series). Fiona was a senior in the same business program with Tucker Holmes. She was slated to be hired by Stone Enterprises upon graduating. Thanks to her minor in investigative journalism she became suspicious of Tucker after he had frozen and played with her. She then started to look into Tucker and nearly found out about the Wand of Kronos before she was frozen permanently by her roommate Chloe Noi and the Ring of the Haetae. She is later chipped by the Type-7 Chip and acts as Spydoll Inc's maid.
- Tales from the Tuckerverse: Life Imitates Art
- Tucker's Wand XX: The New Business Venture
- Spydoll Inc: Destiny Approves
- Tucker's Wand XXIII: Tucker's Nightmare
- Spydoll Inc: Twin Return
- Spydoll Inc: Collaring the Kitten
- Spydoll Inc: Reaping the Rewards