Welcome to STH and MLP battle colab

This is actually to make my detail skills better. Choose who fights who. Only people from any of the stories that I have posted, even OCs, can battle. If its a particular battle, like a race between sonic and Rainbow Dash, make sure that is there and marked so I will know. Lets start with something simple. Sonic vs shadow

Sonic was running in Green hill zone. It was simply quiet and there wasn't any evil going on like how it usually was. A few moments later, he ran into a black and red hedgehog.
"Shadow! Nice to see you."
"Yeah, yeah. Feeling a bit bored..Wanna fight?"
"Sure"
"Come on..- wait, yes?"
"Yeah. Come at me."
"Alright then."
Shadow sped towards shadow. He was about to deliver a kick, but Sonic quickly noticed this. He stepped backwards before shadow landed. Shadow punched at Sonic, who stepped backwards again. This repeated at least 3 times before Sonic jumped over shadow and axe kicked him, and then bounced ofd. Shadow rubbed his head and shot a green arrow at Sonic, who was still in the air. The arrow hit him and sent him a few meters from where he actually was. Shadow then telepoeted and kicked Sonic further. Shadow shot another green arrow at sonic, as he collided with a wall. The arrow bearly knocked him through the wall, and made him bounce off the ground a few adow then began to walk off. Sonic got up slower, and then started to spin. He started to gain more power, until a blue aura violently blasted around him.
"Super sonic dash!" Sonic shouted, as he blasted through the hole he created. He caught Shadow off guard and pushed him with the spindash. While pushing him, Sonic got out of his spindash, and started a 20 hit combo of punches and kicks. He finished it with a heavy kick up in the air. Sonic then jumped off of tthe incoming wall and kicked shadow the other way. Due to the fact he was in the air, Shadow had enough time to wake himself up. He spun himself into a ball and pushed downwards. Sonic realised this and moved backwards at the last moment. The shockwaves had pushed him backwards slightly into the air, but nothing serious. Sonic and Shadow stood still, catching their energy.
"Hold on a minute...," shadow whispered"Chaos energy levels... They're rising..."

The ground started shaking violently. A sudden portal appeared behind them. It glew white and seemed to float. In a matter of seconds, it suddenly began pulling both of the hedgehogs in. Into a new place to battle...

Like that. It would be longer, but yeah. Anyway, cya!
Oh, btw, this will run like a game. In order to unlock a stage to fight in, it must be used in the story.

Green hill unlocked

Green hill(Equestra) unlocked.