now i know what you’re thinking, “there are already sonic villain aus out there”, but i’m here to tell you, this ain’t no sonic villain au! sonic is still a hero here! the difference is backstory.
the tl;dr is that eggman adopts sonic and tails but they’re not evil and he is, but he’s a good dad anyway
eggman finds little baby sonic (by baby, i mean somewhere in the 4-7 range) all alone on christmas island. the hedgehog doesn’t speak, when asked if he has a family all he does is shake is head, he’s quite obviously abandoned. so eggman adopts this little blue hedgehog! he learns sign language, teaches it to sonic, puts his kid in school, and overall is actually a really good parent. but there is one problem: he’s still evil. he still wants to conquer the planet. sonic disagrees with this. when he fails to convince his dad through words, he ends up taking action and destroying robots. eggdad is not pleased by this, but he supposes that it was inevitable that his kid might not turn out to be evil like him. he still continues his schemes of course, but sonic also continues to stop him. eggman does make sure to program his robots to not target sonic, too.
at some point, eggy creates metal to be an artificial brother for sonic. metal matches sonic’s speed, and is also mute. sonic is overjoyed at his new brother :)
and then he meets tails. the two immediately take a liking to each other, and sonic learns that tails’ situation is similar to how his own used to be. immediately sonic takes tails to eggy and demands he adopt the fox. eggdad accepts and now there are three brothers :)
at some point, sonic and tails arrive on angel island. sonic gets the emeralds punched out of him by knuckles, who has NOT met eggman and just doesn’t like intruders. when eggman learns about this, he’s pissed and steals the master emerald. after this whole situation is resolved, sonic tries to get eggman to adopt knuckles, but knux won’t allow it, so he’s an unofficial brother
at around 12 years old, sonic starts speaking verbally (though in periods of excitement or stress he’ll still go back to sign) (this is just how i headcanon sonic normally but it’s still relevant)
i have the plots written down for a lot of the games, so i’m gonna go through the mainline modern ones briefly
sonic adventure: eggman tries to keep chaos out of sonic’s way, fails miserably
sonic adventure 2 is a fun one! the beginning is mostly the same, eggman finds shadow, sonic gets arrested, etc, but then eggman finds out sonic got arrested and is PISSED, so he has shadow rescue sonic. sonic is pissed about the false arrest and fights shadow, shadow is forced to use chaos control to bring sonic to eggdad before the island explodes, and now sonic is with the dark story for the rest of the plot. eggdad brings sonic to space, tails, knux and amy follow, sonic learns shadow is technically his (uncle? second cousin once removed? it’s one of them, idk which), sonic is NOT launched off the ark bc eggy wouldn’t do that to his son. plot happens, shadow “dies”, and adventure 2 is done!
at some point, eggy finds shadow, and sonic and tails are aware of this. they don’t tell anyone shadow is alive though (and eggman doesn’t tell them about the androids)
sonic heroes happens bc metal thinks he’s better at being evil than eggman, now everyone knows shadow is alive yay, and also sonic and tails are immediately sus of this plan
rush happens too but i don’t know enough about rush to accurately change the plot, but i’m sure the plot changes at least a bit
we’re not gonna talk about 06 bc it gets retconned by itself
unleashed has shadow as the protag instead of sonic
colors is almost entirely unchanged except 1, yacker gets hypnotized in the one cutscene instead of tails, and 2, eggdad did his best to make the amusement park enjoyable for his kids :)
generations! hoo boy! eggman doesn’t get invited to the birthday party (it’s his birthday too) so he causes Issues! oh and shadow gens happens lol
lost world… oh boy. this one is traumatic for everyone involved. there’s less arguing involved, but sonic is still an impulsive dumbass (leading to tails getting kidnapped, which traumatizes sonic and eggdad) and eggy presumably falling to a fiery death (only sonic is around to see this). so sonic is having a Terrible Horrible No Good Very Bad Day all around, and the zeti are also trying extra hard to kill him to spite eggface. luckily it all works out, except that therapy Will Be Required
forces is another fun one! for me ofc, not the characters. infinite betrays eggman early on, locking him up, then also defeats sonic, locking him up too. bc i am merciful, i am reducing the time the war takes down to one month (mainly bc really, that’s more than enough time for everything to go to shit). sonic and eggman are NOT tortured (bc that was just a weird translation thing), but more therapy will def be required. also rookie/gadget saves both sonic and eggman
at some point, eggdad creates sage. he does not intend for sage to become his daughter. but also sonic and tails both know sage from the start, which is relevant for this next bit
frontiers happens next, and really, the main issue is that sage Refuses To Properly Communicate With Sonic. eggy doesn’t want to put his kids in danger so he tells sage not to run any simulations where that happens. in the end though, sonic still has to get involved. and also now there is a Sister :)
tmosth also happens because i fucking love tmosth. the train is sentient which is why sonic gets knocked out
will add some links to character descs and stuff when i post more about this au (and i’ll also try to come up with a name while i do that)
Omg I don't even really remember aaaaaa, I do think it was my buddy smash's idea!! Think it just started as a 'hey metal is there, so why not omega too as sibling number 4' and of course he then needed included ✨
