Leviathan

Leviathan is a sea serpent summon that appears in many Final Fantasy games. Its first appearance was in Final Fantasy II, but Leviathan's first appearance as a summon is in Final Fantasy IV. As a summon, Leviathan uses the attack Tidal Wave, which damages all enemies with water-based magic. Leviathan is named after and based on the mentioned throughout the. Leviathan is generally depicted as being blue, although some games depict it as purple or green.

Final Fantasy IV
In Final Fantasy IV, Leviathan makes its first appearance as a summon. It has a purple body, and its mouth and the tip of its find are red. Leviathan also appears as a boss. During the game, Rydia is kidnapped by Leviathan, who raises her into becoming a Summoner. Rydia can later learn how to use Leviathan as a summon, and it costs her 50 MP to use Leviathan in battle.

Chocobo Racing
In Chocobo Racing, a Leviathan appears in the background of the Fantasia race course.

Final Fantasy Fables: Chocobo Tales
In Final Fantasy Fables: Chocobo Tales, Leviathan is the guardian of the Water Crystal. It is featured in the pop-up book and minigame, The Boy Who Cried Leviathan. In the book, which is a parody of , a young Chocobo falsely exclaims Leviathan a few times. When a Leviathan actually came, nobody came to the boy's rescue, as he had lied the previous few times. He sinks underwater, and during the minigame, Chocobo and his rivals have the role of the young boy, as they try and swim away from the Leviathan, whom Bebuzzu takes on the form of, swimming after them. There are six different pop-up cards of Leviathan.

Super Smash Bros. series
In Super Smash Bros. for Nintendo 3DS / Wii U and Super Smash Bros. Ultimate, Leviathan appears in the Midgar stage as one of the possible summons released from Summon Materia. Leviathan's appearance is designed after its appearance in Final Fantasy VII. If released, Leviathan floods the underside of the stage.

In Nintendo's Super Smash Bros. for Nintendo 3DS and Wii U - Final Video Presentation video, there is a unique splash card for Leviathan.

Final Fantasy IV

 * Final Fantasy IV Advance instruction booklet (page 39): "Summons Leviathan, spirit of the deep blue sea. Causes a massive tsunami that inflicts damage on all enemies."