1. The Silver Surfer
The Silver Surfer started out as Norrin Radd, an astronomer from the planet Zenn-La. He became The Silver Surfer after he agreed to be Galactus's herald, his servant. This leads to him acquiring incredible power, transforming his body into an indestructible metallic substance and a silver surfboard that he uses to travel across the universe. After speaking with Alicia Masters, he realized what he was doing was wrong and decided to disobey Galactus. He then quickly became Galactus's toughest rival. Thank goodness The Silver Surfer turned hero because as a villain, he'd be unstoppable. His powers include the ability to absorb and manipulate the universe's ambient energy, navigate through space at hyperspeed, super human strength and endurance. He can also project energy in various forms for offensive and defensive purposes, as well as having the ability to see through time. His senses give him the ability to detect objects light years away and to perceive matter and energy, including life forms. He can also use his nearly indestructible board to attack and capture enemies. Did I mention he can phase through matter and cast illusions? The Silver Surfer can just do it all, he's absolutely unstoppable. His weakness? The only thing I could find or think of was on occasion his board could get damaged, HOWEVER, he's always been able to repair it so I don't think he has any real weaknesses. If he does, I'd love to hear them. Knowledge is power.
Now understand, I'm no expert, I'm just pretending to be so if you disagree with anything or anyone on the list feel free to let me know. I can take it. Be heard.