Sonic X: Metallic Soldier

Designation Metallix. It was the name you had grown accustomed to after having your body broken and destroyed to a level that would've killed anyone else. Luckily for you Professor Ivo Robotnik was capable of transferring your mind to a body that suited a Soldier of your caliber. Though the transfer ended up costing you a good deal of your memory putting some blanks in your life. With your newfound body and potential you've been in battles that would've taken hundreds of soldiers and robbed their Families of them. But now? You take the brunt to protect your allies from suffering the way you did. The enemy that caused this? The Black Arms. Ruthless black creatures from space who seemed set on fighting Humanity for something and their ruthlessness was met with Humanity's will to resist them. All you could remember before it all went dark was charging the leader of the Black Arms ready to put them all down. But he had something you weren't prepared for. This Leader's name? Black Doom.