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Please tell more about your metal sonic au!!
If you want the short version, it's basically "Metal Sonic pulls a Megamind after Sonic's death and takes his place as the new hero"
If you want the long version, then search though my "machina au" or "doppelgänger au" tags on my Tumblr. I will post more about it eventually!
I like to think that since Machina!Metal took on Sonic's identity after he died, wouldn't that mean that according to Metal's logic, if they are forever linked together like in the OVA, then the next step would be Metal giving up everything that had been tainted by Eggman's influence, in exchange for being truly free like his copy was.
Like that whole gesture represents Metal switching places with his counterpart.
It's like he's exchanging wedding vows, and how, through weddings, people are forever linked together, like how METAL IS FOREVER LINKED TO SONIC, IM-
I came up with this amazing Sonic AU with lots of lore surrounding it, and it's been brewing in my brain for weeks now, so I decided that I'm going to share it now. The AU is just a "What if" scenario, the senario in this case being "What if Sonic dies and Metal Sonic takes his place?"
During one of Eggman's evil schemes, Sonic sacrifices himself to save the world, and Metal Sonic absolutely looses it. He had been thinking about betraying his creator for a long time now, especially since he technically lost his free will after Sonic Heroes. Well, now he gets his chance because Sonic's death was the final nail in the coffin, or rather, the glitch in his code that led him to fully defect from his creator.
In his desperation, he stumbles upon some scrapped scheme, a failed plan that Eggman never set in motion; Holographic technology. So Metal does a bit of DIY and uses this tech to disguise himself as Sonic, essentially finally taking his place and becoming the next hero of Mobius.
In fact, this disguise is so good that even Dr Eggman is fooled and thinks that Sonic is actually alive (he probably thinks that Metal got destroyed or something). Tails however, knows that something is wrong, because Sonic's body had been recovered, and there's another Sonic running around, but he's more...robotic than usual. So Tails decides to do some investigating.
Metal, however, won't stop until he's achieved his ultimate goal, defeating his creator once and for all.
Im calling this AU the "Machina AU" or the "Doppelgänger AU"