Creative liberties (regarding his expression lmao) were taken without shame. And also his face crest.

The little glowy things that seadragons have HAD to be included. I find them so goofy and funky on them in game.

He is so big due to deep sea gigantism.

You know why orcas/seals have the coloration they have? To camouflage from above & beneath? His coloration follows that pattern, but since in the Lava Zones the lightsource comes from below, his lighter colors are on his back and the dark colors are on his back.

Not for hiding himself from predators, but from the bits of prey that swim around in the Lava Zones.