Leviathan

The passive leviathan is monstrous in size but gentle in nature it looks like a far larger whale with a shorter mouth and a multitude of additional parts.

Culture

when your as big as a leviathan you need multiple ways to survive, the leviathan not only feasts on plankton like its whale cousins it also has filters where you would expect gills that can feed much like a whale shark. should it ever have a run-in with a kraken or other such enemy it can also digest meat.

the leviathan is highly intelligent able to even speak telepathically to those nearby should it wish to. despite this the leviathans have little care for concepts of good and evil and will not partake in such partisan things as a whole

the inside of its mouth is far larger then a normal whale because of which it can easily be use as a transport should somone be able to convince one to be such a thing