Richard the Lionhearted.
You can't mention Richard without mentioning Salah ad-Din. The two go hand in hand, and had the
utmost respect for each other. Had they met in any other circumstances they'dve likely been friends.
Also, Feldmarschall Rommel was one of the best modern Generals, and absolutely a douche. If you look over his history, he was strict taskmaster, but on the flipside of that he fought
in the trenches with his troops and would not command of them anything he would not do. So although there was resentment among his officers, his troops were fond of him, and there was distinct loyalty in his legions. Also, he predicted the assault at Normandy, along with a few of the other generals, and all but demanded his panzer division be moved to Normandy, but Hitler refused. By the time they arrived when the attack started it was already too late. Could've changed the entire allied campaign.
However, much like with Richard and Salah'ad-Din you can't mention Rommel without mentioning both Patton and Eisenhower. Though Patton largely receives credit for Rommel's defeat in Africa (which is not without its truth), the plan was primarily Eisenhower's, and it was Eisenhower that really drafted the strategy that would halt the Blitzkrieg in its tracks, though Patton executed it, and let's be honest -- whenever you have a plan, everything that can... will go wrong. Patton, also, was twice the badass Rommel was in personality, if not his equal on the battlefield.