Finally made a proper visual reference for this guy.

This character is super hard to write a proper description for without going on and on so I'll try to keep it simple.

Vexxus is an invertebrate alien. All of his internal organs are made of the same oobleck like goo. His outer skin is a thicker variant of goo mixed with powdered rock that gives it that dark color.
His species is insect like, they hatch from eggs and live as grubs for the beginning years of their life until they cocoon and reform their fragile goo bodies into something stronger and more dangerous. They have no bones, but their bodies are very adaptive. Vexxus, for example, has made use of another predator's carnivorous teeth.
Those six wings of his can meld seamlessly against his body.
Vexxus is a temperamental creature, he is aggressive and can be very dangerous if provoked. He can eat nearly anything, but his favorite food is meat.