Nate

Background:
Nate is a spiritual guru, similar to how Iroh and Jinora are in both ATLA and LoK. His whole thing is he wants to keep things as peaceful as possible for both the humans and the spirits. He knows something has thrown off the spirits to where they’re more chaotic, but doesn’t know what it is, and wants to find out. Nate has also studied Iroh and Jinora's journals, and first hand accounts from what has been written about them and learned much knowledge about the Spirit World through them. Nate doesn't know where he's from, though he does remember who his parents, are and knows he and Green have been close friends for years. His allegiances are with his fellow Air Nomads and keeping the balance and peace between all nations.

Lore:
From the beginning of when Nate came from the old world, he was trying to figure why the world has been thrown out of balance. He heard rumors of humans bribing the Spirits, which doesn't make sense to him since he's never heard of Spirits taking bribes. As he starts his investigation, he finds his friend, Green, is also in this world. They both converse with one another as their friendship shows. He also befriends his fellow Air Nomads such as Ash, Sal, Quig, Sophie, Garrett, and Misty. Soon after, The Voiceless Spirit, Pure, gives him a flying bison by the name of Greg, who's been his best friend. Though he has died, Greg was reincarnated into another flying bison which Nate appropriately named him Gregg. During this time, Nate has been helping build up the Spawn Air Temple from the ground up, building three towers dedicated to each of the Spirits: The Voiceless Spirit, the Moon Spirit, and the Ocean Spirit.

Nate was with Mason, Green, and Lumiinara when they were teleported to the Air Temple after their adventure into the Spirit World to see Mason's deceased pet bison, Sandrew. Letting them know that the area they were describing was the Valley of Lost Souls.

Nate is approached by Red about a mission that he wanted to. He wanted Nate to ask questions about where the Earth Kingdom was at when it comes to their defenses, resources, etc. Soon after, Sal comes in and tells Nate that Red was using him to spy on the Earth Kingdom. This comes to a shock to Nate since he's naturally a very trusting person and wants to think the best of everyone. This sets him off to start having a bit of trust issues with him.

Nate becomes of the founding members of the Probending team, the Flying Fire Moles, along with Red and Green.

When giving a tour of the Spawn Air Temple with other people from every one of the Nations, Mason approaches Nate to ask for advice on getting rid of the nightmares about Sandrew dying again. Nate gives him advice on meditating and learning to move on, but still cherish the many memories he made with Sandrew. Mason doesn't take this advice and gets very angry with Nate. When this happens, Mason eyes turn red, showing that it wasn't Mason in that moment. Nate tells everyone to stand back. Mason then kills Nate and disappears.

After a while, of Nate being gone; Ash, Garrett and Misty had gone to the Ocean Spirit, Chipcy, to see if they both can get to the Spirit World, main goal to revive Nate. Chipcy found out he was lied too but allowed Nate to be revived, with help of giving Chipcy Golden Apples for a week... The Ocean Spirit had another thing noted about Nate however, if no one can get Mason dealt with, the Airbender returns back to the Spirit World, gone.