First off, I didn't finish Morrowind (or the earlier) soo I can't the full story that good. The combat system in that game SUUUUUUUUUUUUUUUX!!! (oh well, not the worst one I guess).

But our hero from IV/Oblivion become the next Sheogorath becous off the DLC Shiver island. And in V/Skyrim DLC Dragonborn, we become Hermaeus Moras champion. According to him. Soo I won't be suprised if the next games we can read/know our hero in Skyrim become a Dragonborn/Daedra hybrib to Hermaeus.

But what I wonder is, do you think many of our heroes will become champions to the daedras later on in the series?

If the question is "will Bethesda put up DLC in next games making your player champion of some daedra", the answer is probably "yes". You can still chose not to make your player the champion of anyone though.

I've never played Shivering Isles and my current character in Skyrim won't play the black books.