Get transformed into one of the mane six and remain stuck on this miserable rock, you say?
Alright, I’m gonna go ahead and make some assumptions on the mechanics of this.
Since it’s me that gets transformed, instead of the pony just popping in through a portal, I’ll assume she’ll inherit my knowledge and memories alongside her own. She’ll still be herself, mind you, just with all I know added to her archives. Presumably my personality will still be knockin’ around her noggin too, in the manner of a controlled split-personality disorder (meaning I can give advice and such, but not control her actions).
And seeing this is a different world in a different universe, it’s safe to assume many of the more fantastical aspects don’t quite work the same way here. You gonna try magic? Too bad, Sparky, it don’t work that way ‘round these parts. Whatever mystic energies you weaved into spells back home either don’t exist or are vastly different on this planet, so no superpowers for you. Sorry.
Flying will be much trickier as well. There’s two options: Body weight is lessend (by hollowing out bones and reducing muscle mass) so you’ll be able to fly in this atmosphere but your constitutions is much weaker, so don’t go crashing. Or, you retain your original body-type and are unable to fly very long due to your weight dragging you down. Bad deals both, no mistake.
Physics themselves work differently, so shit you could pull off in Equestria ain’t gonna fly here. Sorry, Pinks, the legislation of reality is more strictly enforced here, so no ’toony stuff, ya hear?
So, if you’re hoping to get any new advantages, Earth Pony is the way to go. This a dimension of might, not magic, and the good ol’ buckin’ hooves are most definitely things of might. You’ll be kickin’ through concrete in no time at all. Like I always say, “Being an Earth Pony sucks, right up ’till you fall down a flight of stairs and realize your bones are stronger than solid rock”.
But what about little old me, though? Who’d I chose?
Well, I think I’d go with dear, sweet Fluttershy. Why? Because, in all honesty, this world needs more kindness. That, and I’d get to be a mental stowaway in the mind of my favoured equine, so what’s not to like, eh?
Right, so she’ll be pretty damn terrified of this place, no doubt. But hey, she’ll have me for a guide. Alright, yeah, maybe that’s not a very good precedent. What I mean is that I used to be quite the scaredy-cat myself, back in the day. And since she’ll inherit my memories of those times, she can learn a few lessons in overcoming fear from there.
See, the thing with Flutters is that she’s got an enormous amount of inner strength, she just doesn’t know how to use it. Don’t believe me? Try pushing her, see if you ain’t beggin’ to LOVE HER by the end of it. Now call me crazy, but I think people with that kind of fire in their bellies are the ones that go far in this world. So, a bit of the “school o’ hard knocks” to toughen her up while still keeping the same ol’ core of sweet, loving kindness, and voilà, you have a winning recipe.
Of course, that’s easier said than done. Her anxieties are pretty crippling, after all, and this is the sort of world that abhors a kind soul. But, since I’m knockin’ around her noggin as a mental construct, I can help her along. Y’see, I’m like Fluttershy to a downright scary degree. Quiet, doesn’t particularly like being around strangers, is generally kind but will turn downright psychopathic when the right buttons are pressed? Whose psych profile are you reading off again? I’d wager the only real difference is that I’m not quite as innocent, but growing up on this rock kind of does that to you.
Since she and I are such soul-mates, we should hit it off pretty well. I can see her objecting to my occasional bloodthirstiness, but eh, I can learn to tone it down. So, while I can’t directly control her actions (due to being, essentially, a little nagging voice in her head) I can advise her and she’ll likely consider my counsel trustworthy.
Thusly armed, she’ll be able to gain allies with her natural kindness and avoid being exploited with me cynically pointing it out when it happens. While she might not have much in the way of raw power and physical ability (due to being subjected to real physics as stated earlier) she’ll have a legion of not only human but also animal supporters at her disposal, and that’s a force to be reckoned with. Let me tell ya, you’ll go places on this rock if you can get a big following, and nobody can build an army like that meek little pegasus. Ironic, huh?