Who is Night King?

The Night King is the leader and the first of the White Walkers, having existed since the age of the First Men. By extension, he is also the master of the Wights.

Here is a major difference :-

• White Walkers are the otherworldly humanoid ice creature living from ancient times created to protect Children of the forest.
• Wights are the undead human just like zombies brought back to life by White Walkers.

Now back on main topic, before Night King became a White Walker, he was a First Man that was captured by the Children of the Forest, Leaf among them. Leaf pressed a dragonglass dagger into his chest, causing his eyes to turn blue and turning him into the first of the White Walkers.

Children of the forest created the White Walkers to defend themselves when Westeros was invaded by the First Men, who were cutting their sacred trees and slaughtering the Children of the Forest.

The Night King possesses a number of supernatural powers or abilities – it is not, at present, clear how many of these are unique to him, or if other White Walkers possess some of these.

• White Walker conversion
  The Night King can turn a human baby into a White Walker by pressing the tip of his finger to the baby's cheek. The child's skin will begin to pale and its eyes will turn the same blue as the other White Walkers.

• Raising wights
  The Night King can raise corpses as wights. He doesn't require physical contact to do so, and can raise thousands of wights at a single time just by lifting his arms.

• Superior strength
  Although he has not been observed engaging in single combat, the Night King presumably has the same enhanced strength that other White Walkers exhibit.

• Weapon shattering
  The Night King's touch can presumably shatter regular metal weapons, as with most White Walkers.

• Marking
  The Night King can mark someone so that he knows exactly where that person is, and no magical boundary can stop him from pursuing a person so marked.

• Minor seismic control
  The Night King can cause fissures in the ground.

Now there are many theories revolves trying to figure who really was the Night King. Some believe he was a Knight at Wall and other believe he was a Stark Lord. But we can't be sure where the show would take us.

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