Ebony Maw

Another member of the Black Order, Ebony Maw is admittedly not much of a physical threat, As you can see, he's not exactly super ripped. That, however, should not make you underestimate just how powerful he is. He may not have giant muscles, but what he does possess is a special power of persuasion - able to whisper in ears and get things done. So while Iron Man or Captain America could just punch him in the face to knock him out, they are in serious trouble if he successfully sneaks up on them and starts telling them what to do.