Also, I think King Gothryd of Daggerfall (or one of his relatives) could be a possible heir. In Daggerfall, an agent of the Underking says,
"not even death can hide a true descendant [Lysandus?] of Tiber Septim from the Underking". It may have just been a metaphor or something, but I doubt it - especially since the Underking is (more or less) Zurin Arctus, Imperial Battlemage to Tiber Septim himself.
Power alone wouldn't be enough to grant him the title, Emperor. But I wouldn't complain too much. Of all the royals in Daggerfall, this one is actually a decent guy.
Ah, Prince Lhotun. The only noble in the entire Iliac Bay who actually gave me a
useful magical item as a quest reward.
The floating city is troubling. . . and sounds Like necromancers. . . everyone knows I am a fan of the Daedra. . .
They've both become totally overhyped and cliche'd plot devices since Oblivion. Why can't we go back to the days of Daggerfall and Morrowind where these factions were more subtle? While we're at it, let's have a novel about dragons and gunpowder. Please. There's more interesting things to explore in the world Bethesda has created!