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Please read the descriptions. Both if these tropes have clear definitions within the first few lines.
Hugh Mann: "Someone has gotten duplicated/taken over/impersonated by something not human, and the duplicate is trying to pass as a main character. But they do a terrible job of it... Luckily for them, nobody notices at all. Or at least nobody anyone will listen to"
Most Definitely Not a Villain: "A character is put into a position ...where they must impersonate someone or pretend to be a member of a particular group. The character, instead of simply acting like an X, attempts to do this by constantly announcing they are an X, that they're doing things because that's what an X does, and there is not the slightest chance that they could ever not be an X. Did they mention they're an X?... [I]ts effectiveness as a disguise depends on whether it would be funnier for the impostor to get caught or not."
They are similar, but not duplicates.
Locking this thread.
...if you don’t love you’re dead, and if you do, they’ll kill you for it.
What is the difference between this trope and Most Definitely Not a Villain? Is it that it's aliens impersonating humans?