Avatar: The Last Airbender / The Legend of Korra - Hi there, i heard you asked for some feels

Of all the people she could have ran into in the Spirit World, who even guessed that she'd meet the Wisest old man of them all?
It makes sense in retrospect, but really. This was completely unexpected and in a very good way.

It's not just a cameo – he gave her important advice on how to survive in the spirit world, and giving out good advice was basically his whole role in TLA. I'd say he was well used.