A visitor arrives in Equestria, bearing a wealth of knowledge and a troubled past. The Mane 6 are quick to befriend the stranger, who helps them to discover what they truly value in life, and how to achieve it.

But learning to overcome their fears and achieve their desires comes at a steep price, paid by their innocence.

I'd heard about the TV show My Little Pony: Friendship is Magic from my college roommate who is way too into the show. Disturbingly so, actually, but good gravy I would never watch the darned thing! What am I, five? I've got better things to do with my time than watch a silly little girl's show. However, that didn't stop... something from transporting me into the world of the show, so here I am... in Equestria... trying to get home. This is gonna be interesting.

Special thanks to GuyFace, Jack Kellar, Storm Shaker, Spiffy McSquee, and Goober Trooper for helping me with this one!

Sam wakes up in Equestria stark naked and with no clue how he got there. More problematically, he seems to be in somepony's home.

Teen for nudity and the awkward situations arising from said nudity.

A rewrite of Make Friends, or Die! by Sam Polson (which has since been taken down). I liked the premise, but Sam's English was spotty and Google Translate didn't help him much. Starts going in its own direction fairly quickly.

Suppose you found yourself in a strange body and on an unknown planet, with only a lonely dentist for company. What are you willing to do to get home? How hard would you fight? Does it matter if you're a princess or just a person?

It occurred one peaceful night. Half of Equestria awoke to the sound like a double-shot thunderclap. A percussion heard in the skies and rattling windows from Apploosa, to Canterlot, to Ponyville. Nopony knew what it was or what it heralded for the world as it drew a line across the nation.

For Twilight Sparkle, this isolated incident might have faded from memory after a time, if not for the strange rumors of a creature sitting on the hill on the outskirts of town.

These are her thoughts given written form. These are Sparkle's Notes.

Report EVERYTHING to the Princess.

The Princesses find an alien creature barely clinging to life at the scene of a terrifying crash. Can the Combined Power of the Elements of Harmony save it, or more importantly, should they save it? Will the arrival of this strange creature tear Equestria apart?

TV Tropes
https://tvtropes.org/pmwiki/pmwiki.php/FanFic/Article2

The star system Omega Centauri was just another oddity on a map to scientists in the not too distant future. However when they found the star was orbiting an earth-sized, earth-like planet instead of a black hole as its motion had suggested, a mission was scrambled to investigate this most unusual of celestial behaviors.

Hamstrung by politics, and nearly crippled before it began, the 'Lone Ranger' mission was reduced to just one crew member and left to his own devices.

These are the logs of Arrow 18 and its lone commander. This information is classified TOP SECRET by the Global Space Agency.

Do NOT tell the princess.