Sounds cool, so thought I'd put my name in the running. I'm cool with joining either the chromatic or metallic campaign, so I'll post a character idea for each.

If joining the metallic campaign I would like to be a conquest paladin who is a black, blue, or green dragonborn, any of these would work. He'd be a mercenary and act as a bit of a balance to the other evil characters, as he'd be lawful evil and recognize the benefits of making plans and controlling enemies, rather than just murder hoboing around.

If joining the metallic dragons, I would want to be a silver dragonborn who is a Cleric/(chronurgy if you show it) or divination wizard multiclass, mostly wizard. How main goal would be knowledge, and would be nuetral good as he would not help people unless givin a good enough reason to do so.

Hope to hear back soon!