WARNING! THERE MAY BE UNMARKED SPOILERS!
- Given what the TARDIS does to Compassion, the idea that she/it deliberately modifies Fitz becomes even more plausible.
He's also planning to completely alter the basic functions of reality: he wants to completely alter the whole entire multiverse, so that it's only one universe and doesn't branch off into other universes every time a decision is made, with a side of planting human DNA at the Big Bang so that the universe will be dominated by humans (because Humanity Is Superior). Also, as far as the aspect of Speculative Fiction Übermenschen tending to have some kind of superpowers, he is inexplicably Made of Iron and in one book develops the temporary but impressive ability to teleport through time and space.
Another thing: the basic point of his character was originally to replace the Doctor, and when he first appeared the Doctor was The Last of His Kind and a dying amnesiac, suggesting some sort of allegorical God Is Dead... thing. And, in accordance with Nietszche's statement that not only is God dead, but "we have killed him", Sabbath is supposed to be killing the Doctor, although for a few reasons, he keeps saving his life instead (which he decides to rub the Doctor's nose in). The only problem is that his whole quest is kind of other people's ideas, even though he seems quite personally invested in it. Is he a subversion of the Übermensch... or is he just using his bosses, too? It's unclear. Also, he keeps screwing up, which isn't terribly Übermenschlike, but oh, well.Anyway, he does hit all the major points:
- Big ideas
- Complete disdain for social conventions
- Highly charismatic
- Erm, the reason Miles got mad seems to be more along the lines of Sabbath being intended as more of a Rival Hero Antagonist rather than an outright villain, not from having supposed to have been any sort of Ubermensch. Doesn't disqualify Sabbath for the position, but just saying.
- Alternatively, Miles just likes getting mad. He's a bit like that.
- The Doctor. Possibly the most obvious guess according to Occam's Razor, since it doesn't introduce anyone new (as with Benny or anyone else totally out of left field) or involve him flat-out lying (as with Trix). Fitz's sudden lack of patience with the Doctor (and the Doctor's amnesia) in The Gallifrey Chronicles is a subplot anyway. It seems to have come out of left field, but if he'd been in a romantic relationship with the Doctor prior to the Doctor developing amnesia and had been waiting for the Doctor to remember it, but finds out (as in the song) that the Doctor just finds someone else, it would make sense why he's in a snit. Which would fit with the fact the song seems to be talking about the final nail in the coffin of a Dry Docked Ship: he refers to their love in the past tense (and "we used to talk of destiny"), but them leaving him in the future tense, implying they're neither together nor have they broken up, but they were together once. And it makes sense that someone would have a file about the Doctor. And this line would seem to relate to what happens in Interference:And read you won’t wait for me.I would have waited for you.
- Anji. Oh, no! Still, she's got a new fiance (who Fitz doesn't seem to be a huge fan of), and Fitz does mention that whoever he's singing about has some new guy.
- Benny Summerfield. Just because he's never met her in canon, making it a sort of New Old Flame deal, doesn't make it that much more far-fetched than any other possibility. And the song seems to imply somewhat that he's talking about some time-traveling adventurer. And the author of The Gallifrey Chronicles happens to have written some of her stories.
- Trix. He lied when he said it wasn't about her. But if he'd read a file about her, you'd think he'd know more about her than he does, such as what her real name is or why she's wanted for murder.
- River Song. Although the song was written prior to her introduction, and it's unlikely that her character was influenced in any way by the song, it's still somehow the most logical explanation. The title is "Contains Spoilers", and "spoilers" are a bit of a motif with her. And if it's River, then we know perfectly well who the other man he mentions in the song would be, also explaining somewhat why he gets shirty with the Doctor all of a sudden.
- On this wiki the EDA and Big Finish Doctor Who are in different continuities. The Night of the Doctor apparently made Big Finish canon. In The Gallifrey Chronicles three Ninth Doctors are seen (though no War Doctor). Perhaps this 8th Doctor regenerated into the Shalka Doctor, who was partially inspired by Fitz Kreiner into becoming a Deadpan Snarker.