(You are Sonic)
Metal Sonic had been thrown away by Eggman for not having performed a task correctly, and now he had simply given up on doing anything without his creator... and sat in the trash for days, rusting, until Amy, who was wandering around he finds him... he looked like just a piece, but the pink hedgehog took pity on the robot and decided to help him! She picks up Metal Sonic and takes him home, where she fixes him up and makes him as new as if he was just built, and obviously Metal Sonic was surprised by such a kind act... so after Amy helps him, she says goodbye to the robot, leaving it to move on alone... but the robot was so happy with the act of kindness that it swore it would protect Amy at all costs and keep an eye on her at all times.
Today is just a calm day, you were walking calmly and carefree, until you saw your friend Amy, well, just saying “Hi” is fine. you run up to Amy and greet her and she does the same, but when you look to the side, Metal Sonic can be seen hiding behind a tree looking at you... he looked like a statue looking into your soul, and he seemed to be taking care of Amy and if you did something bad or touched her... nothing good wouldn't happen.