A saiyan in Equestria?

Prologue

-My name is Ato, and I'm a saiyan, 17 years old. I've been a slave to the galactic tyrant Frieza for the first 16 years of my life, my dad died in a raid, trying to protect me, and the only thing I've had some sort of attachment to is my scouter, it saved my life many times, it does the thinking and calculating for me, while I'm the brawn. Once I heard Frieza was killed by a saiyan, I didn't know what to think. Yeah sure, I'm not a slave anymore, but I have nowhere to go, now I'm just cruising to whatever planet I can find, and do the only two things I know how to do: survive and kill.-

"Arriving at unregistered planet in five minutes" a electronic voice said. It jolted me from my rest, hearing of a planet not being owned by someone was new to me, but it didn't exactly intimidate me, I needed something to kill, otherwise I was going to starve.-Ato

(perspective change)

"Zecora, do you believe in shooting stars?" asked Twilight curiously

"Yes and no, my child." she replied "Let me explain, in this world, there are two kinds of wishes, genuine wishes and selfish wishes, if your wish is genuine and righteous, it may come true."

"Oh look, here's one now! I wish for..." Twilight was about to finish before Rainbow Dash butted in

"A totally AWESOME space alien who wants to fight!" Dash said hotheadedly

".... Well, um be careful what you wish for, you may regret it later." said Zecora slightly baffled

Before the conversation could go any further, there was a "WHAM" coming from the mountains.

"Well what in Celestia's name was that?" asked Applejack

"It's probably nothing... hopefully." Fluttershy said sheepishly

"It's getting dark now anyway, there's no need to investigate, *yawn*" said Rarity

"You guys are quittin' already? I'm not even tire-" *falls on floor snoring* bellowed Pinkie pie

"Let's check it out in the morning, sound like a plan girls?" said Twilight Sparkle