Years after the war ended. Katara and Zuko settled down and had two children. Kya and Iroh. Ozai had passed and so did Uncle Iroh. Sokka and Suki got married but they never had kids, they just traveled together while Suki retired from the Kyoshi Warriors.
Aang traveled with Appa still. Of course he kept contact with the gang. Everything had gone out the way everyone hoped to be. Even Toph became chief of police and had 2 kids. Ty Lee and Mai had gotten out of jail, but Katara and Zuko got everything they wanted. It was true love.