Scenarios:

- OC is traveling with a group of nomads when they hear rumors about a Secret Tunnel (2x2)

- OC is a servant in the Bei Fong household when the Avatar shows up (2x6)

- OC is a refuge and traveling to Ba Sing Se on the Serpent's Pass or by Ferry (2x12)

- OC is living in Ba Sing Se's Lower Ring and visits Iroh and Zuko's Tea Shop (2x14)

or

-Create your own! (Season 2)