What do you think would happen if Zuko became a ruthless dictator over the years? Also he loves Azula, because I just want me some Evil Zuko and her being loved by her big brother.
Oh, the sweet, heartbreaking angst of someone who legitimately tried his best to be a good person and a good ruler, but ended up succumbing to his worse traits! This would be one hell of an emotional rollercoaster.
His friends would definitively, slowly, turn against him one by one, which would only push him further into the dangerous mentality of needing absolute control and never be questioned. Once Iroh (and maybe Ursa) left as well, it would be the death of the old Zuko - there would just be nothing good left in him...
Except his love for Azula. Ironically enough, the "evil" sibling would be the only thing left that still makes him think before doing things and the people who are good to her get some of the slight compassion he is still able to show. Since he'd have no one left on his side beside her, everything he'd do would be solely for her (and for their kids once they had them) - ruling their nation with an iron fist, getting dragons, re-starting the war, taking prisoners, killing traitors...
Azula doesn't even have to asking him to give her the world - the world is his by right, and he loves her. If he wants to hand it share it with her, he can do that. No one can tell him no, and anyone who tries to do so will be put in their place. Anyone who ever harms his sister, or so much as threatens to, would be shown no mercy.
Azula would be immensily happy. She has the whole world at her feet, and, more important than anything, she has someone who loves her unconditionally and that is absolutely crazy about her. They'd both feel some slight guilt over their cruel actions every now and again, but the crushing majority of the time, the only thing that matters to them is that they finally have everything they always wanted, and that should have been theirs from the start.










