Largest Boss

[Sephiroth]

Have you played Final Fantasy XIII? Is the monster in the screenshot that I posted an Adamantoise? If so, that certainly sounds like an impressive battle and a contender for the Largest Boss in the Final Fantasy series.

Yap, I have Final Fantasy XIII. Of course the monster you've posted is the stronger version of an Adamantoise - but indeed, he eats the monster you have posted. And the Titan really eats this thing - which is only as big as the Titan's mouth.

Well - there are characters like Kefka, Sephiroth, JENOVA or Galenth Dysley who have the ability of shapeshifting (well - Kefka is using his illusions which Sephiroth and JENOVA can use together with shapeshifting as well, but you can't really say who doesn't really shapeshift in a fantasy world). So they can be the largest bosses as well - but of course only a boss you really fight in a large form counts.