#(all mentioned)

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Ok so.

The one who originally made the account was Game!Eggman. He then got both Boom!Eggman and Movie!Eggman involved after he found them whilst messing about with the multiverse for shits and giggles. As you do. He gave them the password to the account and all of them can log in and post whenever they want, as long as they remember to tag the posts with which one they are.

Usually they're all in their own separate universes, but sometimes they'll meet up in each other's lairs and hang out. (Love this because it implies that this specific Tumblr app can be accessed from any universe ever.) They'll also have sleepovers in an apartment Eggman bought a while ago. And it is a MESS. None of them care they're all disgusting.

Game!Eggman is more goal-focused, and wants to achieve world domination. He's the most serious one. Boom!Eggman is a complete goofball. He embarrasses the others by posting so much about food and silly animals. Movie!Eggman is an interesting one. Depending on which movie, he's either threatening, silly but still a threat, or just actually going through depression.

Then we have Snapcube!Eggman. He found out about the account and wanted to join in. He hacked in. None of the others want him here.

Snapcube!Eggman will intrude on the other Eggmen's posts on occasion. When this happens, he's canonically bursting in through the nearest wall like the Kool Aid man. UNLESS he's come to make an announcement. With the announcement posts, the nearest TV has turned on and is blasting the announcement at full volume.

Game thinks he's embarrassing, Boom thinks he needs to stop swearing, and Movie thinks he's annoying. All of them also hate having to fix their walls all the time.

As for Game, Boom, and Movie's dynamic, they're like the worst brothers ever.

Game finds Boom annoying. But only he and Movie can be mean to him. If anyone else is, they're dead meat. He approves of Movie during 1 & 2, but finds him pathetic during the crab era. As for post-movie 3... He can sympathise with feeling betrayed by Gerald, though he does feel a bit of envy. Game wishes his own Gerald had thought of him when making ARK so destructive. At least Movie's Gerald had brought him with him. Game!Eggman is pretty convinced that Game!Gerald would've just left him to die on Earth, if he was still alive and ready to destroy it.

Movie gets along with both of them and is kinda the glue holding them together. Whilst he also finds Boom annoying, he's nicer to him than Game is. Still picks on him a bit, but he doesn't go too far (which Game has done once or twice). He likes gossiping with Boom about Stone, and they both enjoy binging TV shows together (sometimes they get Game to join but he's usually too busy plotting and he also ruins it by pointing out literally any problem in whatever they're watching). Movie sometimes envies Game's dynamic with Sage, wishing he had a Sage of his own sometimes. However he still feels bad for Game after learning that his Gerald was likely even worse than his own.

Both Game and Movie also envy Boom at times. He's stupid, but being oblivious can be a blessing sometimes.

Boom thinks they're all besties. That's it. That's all. No jealousy from him. He wishes they'd be a bit nicer, but other than that, he's chill with them.

Game is the most evil out of all of them. Movie is second because whilst he isn't seen putting animals in his robots like Game does, he plans on dissecting Sonic as well as achieving world domination. Boom is the least evil because he's just a goofy kid's tv show villain. He wants to take over the world and he's willing to kill Sonic, but he wouldn't dissect him because it's gross and disturbing in his eyes.

If Boom!Eggman DID actually kill Boom!Sonic... despite the fact he'd always thought he wanted to destroy him, he'd probably end up grieving too, but not understand why because it was what he wanted. Boom has a strange father-son dynamic with his Sonic that the other two don't have, which is why Game and Movie wouldn't care if their Sonics died (& they'd both probably throw a party), but Boom would.

I'm not really going to explore that on this blog because it's too dark, but it's an interesting concept to think about. Big fan of Boom!Eggman's weird father-son dynamic with Boom!Sonic.

ANYWAYYYY. There's currently a character arc going on with Boom!Eggman, who has met Boom!Stone. Big stuff happening with them at some point. That's all I'm gonna say about it. I've got it planned out in my head... Keep track of the "boom!stobotnik" tag if you want to see that play out.