As the moon spirit, Yue had a lot of duties, some that people knew of, others they did not.
For instance, she had to provide light every night (or, almost every night – sometimes there were special circumstances, like eclipses), help manage the tides, and make sure she followed the proper celestial patterns. Not to mention the fact that she had to lend her energies to hundreds of waterbenders around the world. Most people thought being the moon was an easy job, but they were definitely wrong – it was completely exhausting. Some nights the sun couldn't rise fast enough.
One thing that most people wouldn't guess, however, was that she was also a romance spirit. As a spirit of romance, it was her job to observe people's auras (yes, they do exist – that Ty Lee girl was actually surprisingly accurate with them) and figure out who fit best with who. Luckily, this wasn't a full time job; people were perfectly capable of figuring out their matches on their own, albeit with a lot of trial and error. Yue's main purpose was to simply speed things along.
Generally, she just waited until a potential couple caught her eye before going to work. Not surprisingly, a lot of these couples were friends from her short life as a human - it was only natural that she kept a close eye on them.
And it was a good thing she did.
Author's Notes: Summary may be a bit deceiving. The first bit of this (not sure how much) will consist mostly of Yue watching canon moments from the series, then after the finale she'll get to work on fixing things.
Also, everything about auras I used in here is stolen from a book I read a while ago. Unfortunately, I can't remember the title or who it was by. xD
Disclaimer: I do not own 'Avatar' or any of its characters.
