A fighter card is the most common type of card used in Fight of the Foos. They are used to fight against each other, especially in the form of dueling.
Fighter cards are used to fight against each other. At the beginning of a duel, two players will choose a card from their Hand, which will usually be a fighter card. If both cards played are fighters, they will proceed to fight on a system based around turns.
Fighter cards can be destroyed in several ways: having all of their HP taken away by other fighters' attacks or by being destroyed by cards' effects. This will most commonly happen when cards are on the field.