The first time through, he allied with his brother.
Ozai hadn't always known he was destined for greatness. He had always thought well of himself, as befitted royalty, but with role models like his father and older brother running around, who wouldn't feel a little healthy inadequacy? Still, that all changed when Ozai was fifteen, on the day he first harnessed the power of lightning-bending. He was younger than both Iroh and Fire Lord Azulon had been, the first time he'd done it, and that realization gave Ozai an inkling that he might just be better than everyone else after all.
He dedicated himself to his training, both physically and mentally. He learned the ways of the court and the battlefield, of alliances and death duels. Always, he worked on his lightning. By the time his brother Iroh returned from Ba Sing Se, Ozai could generate the 'cold fire' faster than anyone alive (or even dead, in father's case). The price of that mastery was a certain sense of de