Well, I actually did base his appearance off of a Viper from XCOM 2.
The only thing different is the coloring of the scales and eyes. The scales are brown and black. (if you want to make a pattern go ahead) Eyes are pale green with amber rings. He wears a pale grey shirt and an eggshell white lab coat. He stands at 7'4.
Personality: He is a kind man, loves his jobs (works as a doctor, scientist, and weapon maker), he is hard to piss off. If you go after his kids (hurt or kill) he would go into a blind rage and murder that person.