How screwed are you?

Off to Azeroth? Could be okay ...

I get to live in Eorzea? Sounds awesome!

I wonder if the Monster Hunter food will cure my aching back enough to let me lift a Charge Blade

Hard to say my favorite fictional verse, but let's say Mega Man.
Since I'm not a robot, let alone say Mega Man or Zero or other protagonist, I'm pretty much either going to live a boring ordinary life or I'm going to live an interesting life in a bad way.

Pathologic.
Im capital 'F' Fucked.

Given the fact that 40k lore goes back to the present day and before that (the emperor as an immortal being exists way before the 21. Century), there's a lot of room between you basically live in the same situation as before (just with a living emperor in your timeline) and you're very much fucked (living in the 41. Millennium)

Stardew Valley! I’m gonna marry Leah for sure
- More likely you never see the valley and are stuck in the city the PC starts in, or the war Jodi's hubby is in for the first year.
- Yeah, it was either Stardew Valley or Witcher 3 for me. (I wouldn't last 5 minutes in Velen).

Minecraft. Say, whats that sizzling noi
- eh, just make a few torches

DID I HEAR A ROCK AND STONE?!
- FOR KARL!!!
- ROCK AND STONE
  
  ROCK AND STONE FOREVER!

40K is actually a brighter universe than our real life one. The Emperor might just win and make some sort of heaven on Terra for humanity, becoming a techpriest can make you immortal, there is an actual afterlife and source of free energy.
Meanwhile, we are doomed to be captured and tortured by Rocko's Basilisk in real life, and the universe is doomed to repeat in cruel cycles.
We have been here before.
- i never really "got" Rocko’s Basilisk. why would it want to kill you for not building it in the first place?
  
  Because the people who came up with it assume it would have the same ego as them.
  It's also just Pascal's wager in a robot costume.
- I disagree. The Imperium of Man is basically slowly inching towards its downfall with corpse starch (i.e. ground up corpses) being a common food for hive cities and the Inquisition being an ever looming threat for the populace. Not to mention that if you ever have have the misfortune of being near anything Chaos-y, you are often greeted by the Ordo Hereticus before your life is snuffed out. And considering that Belisarius Cawl frantically fell into prayer when confronted by a powerful AI core of old does show that the Adeptus Mechanicus are far from their power way back when, let alone any promise of immortality for the masses.
  Psychic blanks have it even worse, as they might not even be connected to the warp, meaning they might just fade into nonexistence after their death. And overall, being a Chaos Worshipper isn't that great as well, as most citicem are not treated well, not to mention that the ruinous powers will slowly drive you insane as well.
  Last but not least is that the end of the whole 40K in-universe might be overall crawling to an end, as the Tyranids might be unstoppable by organic beings (apart from possibly the Orks), so it might be that the universe-wide apocalypse is slowly inching closer, leaving only the Necrons behind after the Tyranids seek out the next galaxy to devour.
  I'd rather choose the old boring life here in this universe any day over the one from 40K.
- Don't dare mention it !

Cyberpunk 2077. Welp, with my current "savings" I am screwed. But at least I am into software development. Still gotta learn real fast
- Everyone will live in that reality soon enough

Star Trek, I'm going to Risa!!

As long as, if the need arrives, I have enough money for a witcher - I'm fine with this.

Discworld isn't all that bad!
- As long as you avoid "suicide" in A-M or any similar actions, you're good. There's the occasional attempt at dismantling the universe, but that happens in all multiverses if you think about it.
  
  I'm going to Lancre with the witches.

Probably DC Comics. And it depends what my role in this universe would be. But knowing my luck I'd just be a random civilian that gets wiped out during the latest rampage by Atomic Skull or something. But at least everything gets reset every few years, so that I could live again to be super villain fodder another day.

My ass under Combine rule...
- so not much different then
- Pick that up!

How would this wish work if Kiki’s delivery service world is where I want to live, but my favorite world to read about or play in is Gotham?
- You end up as a cute witch in a quaint Gothic town being hunted by Batman.
  
  Batman's going to call Constantine and things are going to get Dark...
- You have to pick one as a favorite. No splitsies.

Can't wait to date an asari
- enjoy some of that blussy before the reapers come to murder you
  
  Worth it

How about we all live in Farenheit 451.
- don't we already?
  
  Yes
- I'm down for the traveling hobo book club

Aliens universe? Game over man, game over!

Rainworld enjoyers: gulp

Spend the rest of my life on a Culture orbital or GSV? FUCK YEAH

Oh dear, I am reasonably confident I do not want to exist in the world of Kenshi.

Reading The Beginning After the End I'd probably be nobody special without abilities in a nation at war... Fairly screwed. Might be an engineer or scientist working on steam engines or trains.

Does your own universe count?

Welcome to Papa Scorch's kitchen. Prepare for Titanfall.

Mass Effect ... It all depends on before or after Reaper invasion.

Oh wow! Goth eldar! I’m sure nothing bad will happen.