Player (プレイヤー Pureiyā) is one of the card types in Z/X - Zillions of enemy X- TCG. They are the representation of the player in the game.
Player cards are placed in the Player Square at the start of the game together with Start Card, and it cannot be changed during the game. While you may only put 1 Player card at the start of the game, some special rules like Bonds of the Twin Dragons allows the player to put more than 1 Player card.
Player cards are not a mandatory part of the game (the game can be played without it) and they are not counted as part of the deck. However, several Z/X (known as "Partner Z/X") and Event requires you to have a specific Player card in order to fully utilize their ability.
Most Player cards do not possess any ability and only few of them has an ability, but some cards is able to gives them ability during the game.