Nox is Nix's more dangerous but silly-looking twin brother.

Despite having an eternal 'DERP' face, Nox is not to be taken lightly. He is made to kill with a large mouth full of shark-like teeth, two rows that continuously grow back. The horn on his nose he uses to bump swimming mammals that are near the surface into the air and stun them. The only thing that makes it obvious that he is an experiment besides the horn is his see-through belly that shows a more human heart and an actual set of lungs, showing he can be on land as easily as in the sea.
Though Nox is slower on land, he can still nab anything or anyone that ventures too close whether out of curiousity or just trying to get by with lightning quick reflexes.

Nox and Nix are both annoying tricksters and together they're more of a nuisance than anything, Nox's dangerous behavior curbed to entertain his younger twin.

His most notorious prank is Nix humming the Jaws theme to amuse the victim while playing shenanigans. Then Nox will suddenly LOOM over the victim and with his wide teeth showing in that eternal dopey grin, bellow out a deep "DERP" and successfully (most of the time) scare the shit out of someone.