Boeing 757 wrote:1. Star Wars, during the time of the AOTC-era Galactic Republic
As observed before, the Emprah probably takes a while to analyze the Jedi and the ongoing situation with the Sith. Of course, if he's dumped on, say, Tatooine or Yavin 4 without a ship or anything, it's going to take him awhile. If he starts out on Coruscant, he'd move much faster.
Essentially though he has to figure out two things: how he'll use the Jedi for his purposes, and Palpatine's plot to destroy the Jedi and take over the Republic. The former is easy enough, the second will be much harder to find out as only a very few people know about it. Even the Jedi Council is clueless for the most part although they have some idea that something's going on--but they figure it's more likely something to do with Dooku and the leadership of the Trade Federation. They have absolutely no idea (apart from, maybe, Mace Windu or Yoda) that Palpatine is the mastermind. As such, just mindreading people and following bread crumbs isn't really going to get the Emperor anywhere in a hurry as far as the Sith go.
That is actually most likely to be the Emperor's strategy in all these scenarios-- as he meets people, search their minds for information. Where is he, who/what are important/in power/etc, how can I make my way to that place/those people and who can they lead me to, and so forth. He's smart enough to work on a long-term basis rather than just winging it and making it up as he goes.
2. Star Trek, at the beginning of the TNG-era Federation
This one is an interesting setting to put him into. The galaxy is in a state of (at least) detente; nobody's actively trying to knock each other off, although there are some moderate boundary tensions. The Emperor, by 30K, has become accustomed to living in a culture where conflict is a constant after the Age of Strife. Unifying Earth and Mars, and starting the Crusade, has occupied his time for quite a while. The relative peace of TNG-galaxy would be a bit of a culture shock.
The most likely thing for him to do is start working his way into an authority position within perhaps the Federation, although it would be fun if he decided the Klingons were more his game... his precognitive abilities could indicate to him the dangers of the Borg, Romulan expansionists, and the Dominion. From thereupon he might decide to start building up whatever military he has to work with, possibly also making alliances with powerful non-aligned alien races if he can get them to agree to intervene.
A question that does arise is whether he'd remain as xenophobic and human-centric as he is in the 30K verse. Would he take the position of human supremacy, or decide to ally with the alien empires out there for expedient reasons given that the Federation doesn't have that much military strength?
3. Dahakverse, right before Colin MacIntyre finds out that the moon is actually a giant battleship
4. Xeeleeverse, in the middle of the war between humanity and the Xeelee
Don't know much of anything about these. I suppose he would stand on the side of humanity and again work his way into a position of authority. Depends on if he has to personally intervene in the fight against the aliens or not.
5. Foundationverse, just as the Galactic Empire is about to launch an invasion of the Foundation
My Foundation knowledge is pretty weak, but here's my best guess...
His precognitive powers would be competition for the Foundation and Second Foundation, and as well as being outside the predicted timeline, he'd throw both their plans into some serious disarray. The question is, which side would he pick-- Empire or Foundation? And would he allow the Empire to fall into disarray, or would he be more likely to follow the Foundation plan-- or just do his own thing and establish his own domain? There are a lot of unknowns here (at least for me).
6. Independence Day, just as the aliens invade Earth.
This one is pretty different from the other scenarios as it's very short term. He would be playing tactically here rather than strategically, and would be personally intervening in the conflicts most likely. If he has time (it took the aliens a while to actually start blowing things up), he might be able to identify the weaknesses of the aliens and find his way to, I don't know, the President's office, he can easily convince them to go ahead and start attacking the aliens. In the meantime he starts messing stuff up...
7. Andromedaverse, during the time of the Nietzschean Rebellion.
Not terribly familiar with Andromeda, but he does seem to like the whole enhanced-human thing; Space Marines and Primarchs, anybody? So he might decide the Nietzscheans are his kind of people and throw in with them. Short term, Nietzscheans become more unified once they overthrow the Commonwealth; long term, he probably forges them into the basis for a stronger human Empire. If Dylan Hunt makes it back from the black hole, likely he would be offered the choice of joining the new Nietzschean Empire as his ship would be useful (last one left, right?).
If he decides to go with the Commonwealth, I honestly have no idea...
It's a strange world. Let's keep it that way.