You know, a thing that annoys me most about the age gap argument is the fact that people act like it literally makes the ship unhealthy when canonically:
- Aang and Zuko are good, close friends
- They support and look out for each other
- They will have to work together closely in order to shape a post-war world
- Are depicted as having a yin/yang dynamic
- Aang was the first Gaang member to see more than an enemy in Zuko
And so on and so forth. I'm just very confused at how a bond based on mutual understanding and friendship could turn out to be toxic if they ever started dating down the line purely because of a 4 year age gap.
More than that, at the end of the day, they are fictional characters. They are what you depict them to be in fanart and fanfiction. Unless you choose to present a possible relationship between the two as toxic, I don't see where any inherent issue is.