Fanfics that always have Azula stand trial for "war crimes" always baffle me. That could very easily blow up in Zuko's face. Really, what did Azula do during the war that Zuko didn't do before he changed sides? We see Zuko attack civilians all throughout book 1 in his pursuit of Aang. We never see Azula do this. And Zuko faced little to no consequences for what he did. It would make much more sense for Zuko to place the blame for his actions on Ozai, the literal adult who was fine with committing genocide. Not Azula, his little sister. Zuko would be giving his political allies ammo to use against him if he were to put Azula on trial, which is the last thing he would want to do. Because for anyone who doesn't want Zuko on the throne post war? He just gave them the perfect excuse to use against him.