KCO is a true monster book, the guy is an alien just like on the cover. I'd put RK 22 as the next most "monsterish" and I'll concede on the other two. But TGK 58 has a lame cover IMO and the story failed to do anything for me when I did own a copy or two, while KCO 100 just has a spectacular cover. The completionist in me is torn...
An alien yes, but drawn by Jack Keller. I try not to be disparaging about artists but his work on those Kid Colt books really dampens my enthusiasm for reading them. I always prefer the backup stories by other folks.
I haven't read the Totem in a while, but the dino-critter from TGK #58 aesthetically would fit right into an early Tales of Suspense or Tales to Astonish. I agree it has a weak cover, looks like a bit of a rush job.