Sonic blinked, as a Pegasus was teaching birds to sing... In a very quiet and soft voice.
"Huh..." he muttered, as the two watched.
"?" Twilight made a small noise.
"Reminds me of Cream. She's a little bunny that's very young, but has a way with Chao, little creatures, and she's also really good with small animals," Sonic explained.
"Bun- Never mind." Twilight sighed, and trotted up to the butter-coloured mare with a little tremble, but not very noticeable. Only Sonic who was used to having to find small little weaknesses to win in fights he would lose if he made the smallest mistake.

She was nervous, meaning she didn’t have many friends. She can't talk to others easily. Sonic knew that pain. Heck, all his friends do. They stick together, because they're all outliers. Knuckles is the last of his kind... Kinda.
Tails is the only Kitsune in the overworld.
Cream can fly with her ears, and Vanilla is the only actual mother of the group.

Rouge seems to be the only bat in all of Mobius, and is married to a human, rendering her a social outcast in the Underground. Shadow isn't even a natural born Hedgehog.

Sonic and Amy are the only hedgehogs with their speed. They're the outliers. A normal hedgehog's top speed, if they pushed themselves to the point of harm, is Sonic and Amy's jog.

None of them were normal, so they found each other. And they've stuck together, without fail. Even when they started off as enemies, they later became friends, or at the very least, friendly rivals and allies.

Sonic smiled as the two talked, and sweatdropped when Fluttershy got over excited about Spike. Sonic walked forwards.
"How about we leave the little guy alone for a bit? His mom is kinda needing to settle in to where they're staying," Sonic said, remembering what Twilight said before. "Hi, I'm Sonic. Sonic the Hedgehog." He grinned.
"Oh... My... Wow..." Fluttershy breathed looking at him. "You're a hedgehog? But you're so big!"
Sonic winced, but saw Twilight mouth a "Thank you" as she nearly galloped towards the Library.

"So, how did you get so big?" She asked.
"I was born like this, like my mothers, my siblings, and my friend Amy," Sonic said.
"There's more!?" Fluttershy vibrated in excitement. Sonic sighed. This was going to be a long one.

Twilight sighed, as Sonic and Amy stayed up in the top of the room with her.
"Long day?" Sonic asked with a grin.
"Yes," Twilight breathed. "Also, buck you."
"What? Why?" Sonic asked, understanding the swear on instinct on how often Shadow said it to him.

"You called me Spike's mother."
"Aren't you?" Sonic asked, raising an eyebrow.
Twilight stilled, and looked down at the sleeping dragon, and smiled softly in a motherly way, before realising what she was doing, and then sighed. "I... I am. I'm Spike's mother." She then smiled. "Gosh, that's a nice feeling."

"I know right?" Sonic smiled gently. "But hey, at least you can stop trying to keep that distance, right?"
"Right." She smiled, and then looked at Amy. "May I ask why you're so silent?"
"Well..." Amy sighed in a sad way. "My Tarot is saying that something bad's going to happen. I keep drawing The Tower," she explained.
"Uh..." Twilight blushed. "I'm good at magic, not fortune telling," she admitted with a slight chuckle.

"The Tower means an upheaval, or a new enemy. Mostly a new Enemy. I'm always happy when it's just me having to move, because my house got doxxed," Sonic said bitterly.
"Dox- Oh, your home got revealed to the masses?" Twilight asked, catching on.
"Yeah. Doesn't quite matter. I can move house fast. No, what we're getting is a massive change in the course of our lives," Sonic said. "Also, Amy... Not even a Chariot? Just The Tower? No Death, meaning a change is happening?"

"No... But the Reversed Chariot." Sonic suddenly got worried. "When asking about Shadow. Everyone else just comes up with The Wheel."
"Ah, shoot," Sonic winced. "Ok, we'll have to be careful with him then."
"Very."

Twilight just looked at them confused. "Who's Shadow?"
"Loaded question, elaborate," Sonic and Amy said in unison.
"Uh... Is he... A hedgehog like you?"
"Yes and No." Amy sighed.
"It's... A long story," Sonic muttered bitterly.
"Uh... Does he also have Superspeed?"
"Yes and no," Sonic said with a roll of his wrist.
"He's fast, sure. But he needs special shoes to even remotely reach our speed," Amy explained.

Twilight blinked, and gained a pained smile. What. The. Tartarus. "Uh... Colours?"
"Mostly black, with some red highlights." Sonic said plainly.
Twilight let out a breath of relief. Finally, a normal answer. "What's uh... His Lightning colour?"
"Orange." Sonic muttered bitterly again. "Which doesn't even make sense anymore."
"Yeah, like... There's Eight Colours that match up to people. I've got Pink, which is more of an offshoot of a normal Colour, Sonic is Dark Blue, which is possibly the biggest Colour. But Orange isn't seen normally, especially after the whole, Orange got absorbed back into Red and Yellow." Amy explained.
Twilight was getting a headache. She didn’t normally get one. But she was getting one. What's the Headache spell again? "Ok... Uh... What's a unique power he's got?"

Amy and Sonic looked at each other, and then shrugged. "I don't think he has any?"
"Chaos Arrows?"
"Nah, learned that a few months ago." Sonic shook his head.
"Uh... Yeah, no. He doesn't." Amy shook her head. "At least, not that we've seen. Chaos Blast, Chaos Spear, and the Teleportation both me and Sonic can do... But I'm a little weaker with all of that. Sonic is the Strongest."
Twilight was just rocking back and forth, with the absolute Tartarus that was being told to her.

"And we broke her. We broke Twi... Spike is going to kill us," Sonic muttered, looking at the rocking... uh, yearling? Is Twilight a teenager or an adult? Who's to say, not Sonic or Amy!

As they made their way to the Celebration, Sonic and Amy hung back in the rafters, as they didn't want to intrude, and talk to the "Princess" after the festival was over. After all, they're guests, not actual residents.

"How did you two get up here?" Rainbow asked, sitting next to them.
"Ran up the wall," Was Sonic's reply.
"Ran up- You know what? I don't want to know." Rainbow groaned, and swooped down to join her friends on the main floor.

And then both Sonic and Amy saw each other's eyes glow harshly in a Silver light. They both gasped, and looked at the swirling shadows. Of course, someone got the Emerald before them. Why wouldn't they?

Sonic dropped down, Amy hung back to see how dangerous it was, and a Mare with a pure black body and a swirling mass of blue and stars for her mane appeared. She was holding the Silver Emerald in her grip. Sonic groaned. Not one he could summon. It was a bit powerful for that, especially when in use to...
To control Shadow. Shadow, who instead of Red Highlights, now had Silver Highlights, and eyes. He sneered, and rushed towards Sonic, kicking the hedgehog in the chest, and sending him flying into the wall.

"Ow. Now isn't this familiar," he snarked, before Spin-Dashing at the black hedgehog

Author's Note

Facts:
Yuri Lowenthal has been in over 800 voice acting, or real life acting roles. And is the only voice actor to voice Spider-Man the most, possibly.

MLP has no easy way to get facts on the show, or anything related to it, not even in TV tropes. Or the wiki for that matter.

It's true by the way, Sonic's slow jog, is the fastest most other Hedgehogs can run, if they push themselves. I also made it so Amy's as fast as Sonic, because her Hammer weighs a lot, and she's still pretty fast. And Zooey is the only Fox we see outside The Underground.