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Originally Posted by The Apex
The NK can reanimate the corpses of humans and animals into wights. He can also turn living babies into white walkers(we have seen this happen in one instance with Crastors son, presumably he was turning all his sons into white walkers). There has been no evidence that he's able to turn corpses or living adults into white walkers. Leaf was able to create the NK by pressing dragon glass into his chest when he was one of the First Men. We are unsure if anyone else could create whitewalkers the same way or not.
This brings up the question: What exactly is Viserion?
He was definitely dead, so that puts him in the category of the wights, who are your garden variety undead (rotted remains of dead people raised by WWs).
On the other hand, his eyes turned blue, like the WWs and Craster's baby.
This seems significant because he can then presumably be killed by dragonglass.