Yes, they might. There are so many aspects of the Night King's past that are still mysterious. His origin, how he became the powerful and feared being he was, and his connection to the White Walkers are all areas that could be explored further. It would add more depth to the overall story if they delved deeper into his back story.
It's hard to say. The creators might choose to delve deeper if they think it can add more depth to the overall story. However, they also have to consider other aspects like pacing and new storylines.
Maybe. Since the Night King was such an iconic villain, there's potential for related media like books or spin - off shows to explore his back story. It could attract more fans who are interested in the lore behind the character.
The Night King was originally a First Man who was captured by the Children of the Forest. They stabbed him in the heart with a dragonglass dagger, turning him into the first White Walker as an act of self - defense against the invasion of the First Men. But he then turned on the Children and began his reign of ice and death.
Maybe. The show didn't fully explore every aspect of his back story. There could be more details about his time as a First Man before he was turned or about his relationship with the Children of the Forest that we haven't seen.
The Night King was created by the Children of the Forest. Long ago, they were at war with the First Men. In an attempt to gain an edge in the war, the Children of the Forest used dragonglass to transform a man into the first White Walker, which eventually became the Night King. He then started to raise an army of the dead, and his goal seemed to be to bring an eternal winter to the world of Westeros.
The Night King has a mysterious past. It's said that he was created by the Children of the Forest to defend against humans, but things went horribly wrong.