Silver Surfer viewed everything in life as precious and beautiful. He would often spend long times thinking. He would never kill when it wasn't needed, and would often hold back greatly in a fight (even against hated enemies)
During the events of Annihilation, Galactus altered him, so he would "do what needs to be done" to win a fight. Silver Surfer would no longer hold back, but he would still not kill.
When Norrin Radd became the Herald to
Galactus, he was endowed with the Power Cosmic. This granted him many
powers. His skin is made of energy, which grants him high durability (he is
able to fly through a Sun without pain). He is also not effected by the cold
of space, and doesn't need to breathe, eat, or drink (he doesn't need sleep
either, but he likes to sleep so he can dream).
He can also change the molecular structure of
objects and living beings. Using this ability, he can heal others and
himself. He can turn a person into dust if he wanted (however, he rarely
does this). With this power, he can feel a type of energy that is light
He can also fire bolts of Cosmic energy. Power level varies from light, to instant death.
He is also able to endow others with a little of his power.
It has also been shown he can slow/stop time (he cannot, however, "time travel"). He can also create portals to other places and even to other dimensions.
He also has limited telepathic powers (but very high defense against telepathy).
He is able to see through time, and see past and future events.