Awesome! I'm right there with you, I've watched those cinematic videos of the Broken Shore battle so many times. When I played the game I was always Horde and therefore hated the Alliance story but watching Varian sacrifice himself makes me want to start playing again and go Alliance just to avenge him lol.
I did a bunch of research on the blue dragonflight and have a few ideas for my dragon. He's going to be a full dragon, not just a drake but probably closer to drake size than a full adult dragon and possibly from Haleh's brood rather than the Nexus but I'm open to anything and don't claim to be an expert so if you see something working better, let me know. His mortal form would be a human mage, maybe with turquoise hair.
Are you wanting to start at the battle or slightly before? Do you see my dragon being with the Alliance during the battle (either in human or dragon form) or flying in at the last minute to assist? Are we heading back to Stormwind after or is Varian going to play dead so that he can work from the shadows to stop the legion's threat?