Dragon Beast Barbarian

Hello,

I'm building a Beast Barbarian for Tyranny of Dragons and am looking for some suggestions to better optimize how I play him. He's a Dragonborn, but flavored as a human with a dragon's soul/magic through an unclear lineage that allows him to take on a draconic appearance when he rages. What can I do to give this barbarian more draconic flavor (whether through feats or items ideally, but open to favorable multi class suggestions) playing into what one might expect from a Red Dragon?

For example, I've been allowed to give him a neckless of fireball, giving him a massive fire attack like that of a boss. Plus he has Gloves of Cinder and Sizzle (from BG3 which DM said I could home-brew) giving him some fire damage to his attacks. This is the furthest I'd go with home-brew since it's technically from a different DND source.

Obviously I can't make him a real dragon without outside interference, so just looking to get him close on how he operates. Any suggestions are appreciated!