This is a very recent idea-
Lol

story:
Dr.Ivo Robotnik was working in his new creation, a robot able to mimic sonic's every move, the only flaw was that it was too obvious that it was a robot, while walking around he found a body of a mobian, curious he took the body to his lab, he studied the body finding out it was Amy Rose, he took away the whole idea of a robot to mimic sonic and made metal mimic Amy, from abnormal strength to appearance, later that evening he finally made the disk and put it in metal's drive, he also had put amy's skin on it to finish, when it opened its cold green eyes it spoke "Do I look cute father?" Which the doctor replies "Yes my daughter, you are" he teached his new creation everything although it was in its drive, later on this Amy Rose like robot was roaming around green Hills without pulling up suspicious activity for a small while, after a while it "grew up" it skin's replaced and fully Remodeled

Facts

1:he does have a Crush on sonic because let's be honest, putting Amy's whole personality and taste in people would make this happen

2:even though with the appearance metal is still technically a "boy" but his voice was high pitched to match amy's

3:he has no idea that sonic is fleeing from him due to Amy's violent yet caring way to love him

4:yes he calls him Soniku as a way to accidentally alert sonic of him coming

5:he once had a "date" with sonic but it was only a battle between them and the ghosts(sonicX reference-)

6:he is still a 14 year old, so only 1 year younger than modern sonic-

7:he has a classic form, modern form(the one in the picture) and a boom form but I'm still drawing it

8:he isn't an EXE but is just a test or prototype of the Amy doll from sonic mania-

Reference for the story:
Lumpy touch's video of sonic's redesign for the movie

Reference for the character:
Amy Rose, Furnace Sonic(starved eggman's version of metal sonic) and Metal Sonic

Game/cartoon the AU takes place in:
SonicX and Sonic generations

Anatomy:
Exactly like Amy's but the only difference is the clanking noises when he moves, heavy footsteps, the stitch marks and his eyes glowing in the dark(those red lights are metal's actual eyes behind Amy's- and also his Robotic voice

This may or may not be the only time I do something sonic related