I don't want him to speak. Would ruin his bad assery. He's plenty intelligent. I'd agree at this point there's no time for some big, in depth, reveal about NK. He is what he is and created as seen in the show.
Yeah I think his presentation and menacing look has been perfect.
That scene where he raises the Hardhome dead and stares at Jon Snow.... so much malice.... so menacing... all without speaking a fucking word.
The Night King never appeared in the books, he was only alluded to up to the 5th book, so the show got to decide how to present him based on RR Martin's guidance and I feel they've done a really good job.
As an antagonist:
- He's mysterious and evil, and so are his followers
- He's concisely shown to be extremely dangerous
- He and his followers are relentless and this is scary on a different level for the protagonists
- Visually he inspires fear, and shows no apparent fear
- He keeps getting stronger and more dangerous
- He shows an intelligence to his evil/malice that is hard to quantify
- He gives you no reason to empathize with him
The last one to me is a problem in the writing of many antagonists in contemporary shows/movies.
If you build up an antagonist.... a villain.... and then you keep putting your narrative foot on the other side of the fence like "Well he's really evil, but it isn't his fault.... he was driven insane.... he was brainwashed.... he was wronged by someone....", IMO it cuts the legs out from under your villain. And if I don't find your villain compelling, then I won't find the plight of your protagonist against the villain to be compelling.
Yay, 2 people I vaguely sympathize with.... like it or not you need to make the content consumer hate your villain(s) and love your hero(es)