Who's This? The big guy with the impeccable dress sense on page 19 of Who's Who vol. XVII.
How you could have heard of him: Everyone's heard of Alfred, obviously. As for "The Outsider", he was resurrected as a concept during Flashpoint (real name: Michael Desai), and has shown up in the New52 as the leader of the Secret Society of Super-Villains. There he IS Alfred, albeit the Alfred of Earth-3, Owlman's butler. He's had the decency to wear a suit in all modern appearances.
Example story: Batman Family #13 by Bob Rozakis, Don Newton, Marshall Rogers and Bob Wiacek
So in the final analysis, I don't think Alfred as were-Outsider IS viable. He's so powerful (and for no justifiable reason) that he has to be a little dumb, or has to subconsciously hold back, or he'd easily destroy the Batman Family (his stated goal). The new model is a much cleaner concept, but please, leave our Alfie out it.
Who else? Ok, time to move on to volume XVIII, Phantom Girl to Pursuer. I count two or three interesting prospects in there, but don't be shy about suggesting who you'd like to see in an upcoming installment of Who's This?