Big Bad Friend: Although the Imposter is Mr. Egg, the real villain is Captain for starting the zombie virus in the first place.
Downer Ending: Everyone is either zombified or dead, and Captain's zombie virus will likely continue to spread.
Face–Heel Turn: Captain unleashes a zombie virus on the lobby just to spite Player for not reciprocating his friendship.
Fighting from the Inside: Implied. Mr. Cheese struggles to say his Catchphrase and refuses to murder Player on Captain's behalf, instead throwing them both into lava.
Player: Captain, what's going on here? Answer me! Captain:Your friend [Mr. Cheese] here has been infected with my little virus! Player:Yourvirus? Captain: Yes. A computer virus that would infect every pet on Among Us. Including little Toto. Player: But-but why? Captain: Isn't it obvious? I wanted to win, of course! But more importantly, I wanted you to lose. Player: But we're such good- Captain: Friends? Don't make me laugh, Player! You never cared about me, even after everything I've done for you! You love hanging out with Veteran! You love going on little side adventures with Mr. Cheese! But Captain? Well, there's no time for picnics, no time for birthday parties, no time to remember his name! Player: Captain, I- Captain: Save it! Mr. Cheese, take out the trash.
Once Done, Never Forgotten: Captain makes sure to throw some shade on Player and Mr. Cheese for cheating.
Plot-Irrelevant Villain: Mr Egg is the Imposter, but other than his zombified self killing Stoner, he's incidental to the plot, since Captain is the Big Bad.
Player: But we're such good- Captain: Friends? Don't make me laugh, Player! You never cared about me, even after everything I've done for you! You love hanging out with Veteran! You love going on little side adventures with Mr. Cheese! But Captain? Well, there's no time for picnics, no time for birthday parties, no time to remember his name!