User blog comment:Relite25/Do we really know all the Daedric Princes?/@comment-1992639-20120806111802

Supposedly Aedra and Daedra were both of the same sort, except that the Aedra through their sacrifices by creating Nirn could essentially be destroyed while Daedra remained eternal. Aside from the debate wether or not Daedra like Meridia and Azura abstained from creating Nirn as to remain eternal and keep a benevolent eye onto Nirn, I think it is possible that there are a lot of lesser Daedra we do not hear about. Perhaps as lackeys to the Daedric Princes.

It should also not be ruled out that perhaps Daedric Princes can create offspring, at the cost of donating a portion of their own power. While they would simply be 'Daedra', they could theoretically usurp their parents to become Daedric Princes. Maybe that'd be a nice topic for a TES 6: and endgame civil-war between Daedra where many lesser Daedra grow to prominence and Nirn somehow gets pulled into the conflict.