Fic Title: Ozai's Vengeance
Special Rec: 13 of 21
Why This Must Be Read: If you only read one Katara/Zuko fanfic, read Ozai's Vengeance. It's a deliciously long, wonderfully plotted fanfic with an incredible Zuko voice. The slow burn and build of Katara and Zuko's relationship is fabulous but it's the revelation of Zuko's long-standing pining and doubts about his worth as a human being that make me really adore this fic. Add in some political intrigue, a few smoking hot sexy scenes, and a portrait of a land recovering from a war and decades of imperialism and you have a fanfic that truly has everything.
Plus, the fandom really embraced this fanfic, so there is a TON of awesome art to go with it.