Alistair Econoreem 
Barnett
stringtheory - Glover? Guy is in great shape.
Cormier is also real thick and you can tell by looking at him he trains.
The original. Royce fucking Gracie. He looks like your skinny uncle.
nick diaz when facing lawler and shamrock, specially lawler. lauzon's early ufc days, fedor when he is looking extra doughy, cormier, definitely.
Cole Miller
Kenny Florian
Cody McKenzie
Sakuraba
Both Diaz brothers don't look a physically as imposing as their opponents. It's the difference between a sprinter and a long distance runner.
lol
Mark Hunt is huge in person. He's about twice as wide as s normal human.
kendall grove
Physiques alone? The Diaz bros.
FOX Force Five -Cane here to say this; I think it's Korean Superboy tho.Korean Wonderboy?
Also, cabbage and Jeremy Horn.
Paul Buentello, pre-suspension Jon Jones, Tim Sylvia, B.J Penn, Bellator era Rampage, and Anderson Silva.
Saku had a gentle face, pretty assuming upper body but did have pretty solid legs.......be-beep.
Even if I didn't know they were fighters, I wouldn't fuck with DC or Glover. DC is nice and always smiling, but physically he's a tank
Phillip Miller
Maia whose physique i remember being compared to that of a diabetic 45 yr olds
Surprised no one has said Mighty Mouse or Dominic Cruz yet. Neither of those guys look tough, or even sound tough. Both can kick your ass though. Also Fedor. Looks like a regular chubby fat guy, but he was the baddest man on the planet for his window of time.
Jason Dent. I remember rogan saying "dude he has body fat on him, he's definitely not like Thiago Alves" it was hilarious.