Is it, now? That's...a remarkable difference.

[Ignis seemed thoughtful about that, if only for a brief moment.]

Leviathan most often takes the form of a massive sea serpent--she's also called Tidemother or the Hydraean. Ifrit was more humanoid, if far larger than any ordinary person. He was called the Infernian, or...Pyreburner, if memory serves.