[quote=Dredigan]
If my plane were to be conquered, what would your policy be on creating a new character to remain in the roleplay? Is this something that you want to have go on for a long time or is it something where all the players in the beginning are locked in and when they die they're gone and last man standing wins?
[/quote]

I don't expect you'll get conquered. In the event that you do decide that, as part of a story you craft, that your Demon Lord were to get gibber and your plane taken over, you have a few options: 

-You could create a sort of 'captain' character who commands some form of their own host, though under the influence or command of another character's lord.
-You could awaken a new Human Champion, who appears as a direct result of your Demon Lord's defeat
-You could elect to straight up die and help me with NPC control, effectively becoming a GM slave monkey. 
-If there is very good reason for such a thing, if some cause in the RP was to open a Nexus Portal to a yet unopened Plane, you may be able to claim it as a new Demon Lord - this will be a rare thing, however.