In the anime, Fonda plays an Anti-Cure Deck, which reverses the increase of her opponent's Life Points into effect damage.
In the video games, she plays a variety of Decks.
Fonda plays an Anti-Cure Deck which focuses on the reversal of Life Points recovery into effect damage through the ability of "Nurse Reficule the Fallen One". She uses cards such as "Dark Cure" and "Burning Algae" to forcefully increase her opponents' Life Points for this purpose, while protecting her main monster from being destroyed easily in battle with "Brutal Potion".
Her combination of "Nurse Reficule the Fallen One", "Dark Cure" and "Brutal Potion" were released in the OCG/TCG as promotional cards with Yu-Gi-Oh! GX Tag Force Evolution.
In Yu-Gi-Oh! GX Spirit Caller, her Deck is a "Fire Princess" Deck, focused on gaining Life Points while damaging the opponent via her key card's effect.