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human
[Avatar: The Last Airbender] What would have changed if Monk Gyatso had left the Air Temple with Aang, and was frozen along with him for the 100 years?

Rewatching “The Storm”, it seemed like Gyatso had planned to take Aang with him, or at least not leave him alone. What if he had walked in earlier on Aang preparing to leave, and decided to go with him? They would still both be caught in the storm, with the AS freezing them in an iceberg for the hundred years until Sokka and Katara find them. 

How would Gyatso’s presence not only affect Aang and his friends, but the course of the show as well?
gpt
Aang was already a master airbender, so there’s not much in terms of learning how to bend. However, having an older airbender would probably provide the Gaang with 2 things: another master/fighter, and a sort of guide spiritually. If Gyatso chose to fight with the team (not something I’m sure he would’ve done), the story might go a lot smoother. For example, in episode 1, Gyatso would’ve whooped the Fire nation soldiers and Zuko. Maybe Gyatso could’ve pretended to be the avatar to fool the fire nation for a while, so if he gets captured, Aang has more time. 

The other major thing is providing Aang with some comfort from his lost life. Aang would be less upset and attached to the world he came from, and would maybe mature a litter faster with an adult, in that he doesn’t become upset as easily, and may even master the elements faster with an anchor who knows how it feels to be in his situation. 

Basically, imagine Iroh as an airbender and put him in the gaang, and it’s pretty similar.