He's also technically a Lucain, so there is that. XD
I have a 'example' of what he could look like - as he's not made/bred yet:
This is Maverick. He's actually the soul-fragment of a Juridian - much like Luminare. He would, technically be that Lucain's brother. Or rather the older brother of the one that soul-fragment came from. He, too, is a necromancer, and - a lot like Rexus - he's had to suffer consequences. His right arm is skeletal up to the shoulder, so he keeps a long glove on at all times, unless he needs to work his magic.
In terms of personality, he's kind of a 'Serious Sammy' when it comes to his job, but he's also kind of a goofball around his family and people he likes. He always cracks jokes with a sort of macabre sense of humor, and is fond of creeping people out with tales of his exploits, and the uses of necromancy he's done. One thing he won't talk about is what caused the taint that keeps moving through his body [although it's slowed drastically]. If it reaches his heart, it will kill him, but he's intent that that's not going to happen. If someone tries to bring it up, he shuts them down.