"Kingdom Hearts" is influenced by its parent franchise, "Final Fantasy", and carries gameplay elements over into its own action-based, hack and slash system. The main battle party consists of three characters: Sora, Donald Duck, and Goofy. Sora is directly controlled by the player from a third person camera angle. All other party members are computer-controlled, though the player can customize their behavior to an extent through the pause menu. Donald and Goofy comprise the party in most areas, but nearly every level features a character who may replace them. For instance, Jack Skellington can join Sora's party in Halloween Town, but cannot accompany the player elsewhere. In some worlds, the party changes its appearance, has abilities unique to that world or both; the characters can fly in Neverland, acquire aquatic forms in Atlantica which enable them to survive underwater, and gain Halloween costumes in Halloween Town to blend in with the locals.