I know it's common for ideas for him to include a beard and such, however for some reason my brain did not follow that idea lol.
I had an idea more of just a semi-well put together 37 year old, shoulder length hair that's normally in a ponytail for experiments, thin glasses to help with reading and staring at computers for a long period of time, and just simple white or black button up shirts to go under his lab coat- (if he wore one)
I really wish we got to see him human, but at least that leaves room for further interpretation and creativity among the viewers.