I knew some pretty quirky professors who I at times wondered if they could really survive on their own in the world. But most I knew are pretty sensible types.
I got to know my "boss" at UNC quite well over the years, he was pretty normal, great basketball player, and he built his own furniture and brewed his own beer.
I knew John Swenton at Ohio State pretty well, he was quite normal overall, smart guy. My neighbor has some weird things about him, but he's fairly normal, for a physicist. Sort of, usually. He's deep into photography, but he visits very strange places at times. He's off to Ghana soon.
I got to know others at UNC pretty well, more casually of course, I didn't hang out with them. Ernest Eliel was on my committee, he was a pretty neat guy.