User blog comment:Crazywarfire/Dishonored 2 idea/@comment-75.159.19.56-20150526195058/@comment-16533050-20150527033758

Well they could make it something akin to the way the Resident Evil did it after the first game... where each character goes a different path.

Or perhaps, different options are available to each character - say for difficulty or one with magic, the other without.

However, your idea of the devs mimicking the original with Emily being the main, and Billie being the DLC is solid. Though I like the OP's idea too of Corvo and Emily as choices.