Hey everyone in this group!
I asked Tom Hall about how Mortimer was planned to look like officially. Here it is:
"Most of those are known... Helmet is banged up Chicago Bears helmet. Pants are jeans, i thiiiiiink black shirt, and adhering to that old palette, probably blue eyes.
He has no official stunner, just the mangling machine. He likes being more devious than a simple sidearm, probably...."