(Daring Mystery Comics 008, 1941)
A certain number of uboat captains are going to be written villainously enough to meet all of my criteria and Captain Erich von Wolff, AKA the Barracuda, is one such.
Like seriously a real stinker of the highest order. It's a good thing that the Fin is on the case to beat the tar out of him and deliver him to the British. I was going to say that hopefully he was tried and executed after the war but some cursory research suggests that u-boat commanders who weren't killed in battle largely weren't. I'm sure he had a long career as an investment banker or something.
