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Edited by Excessive-Menace YAWK YAWK YAWK YAWK
Look, I don't care about mobile games and I've already read and watched Harry Potter and the Goblet of Fire, but please use spoiler-tags anyway.
I'm pretty sure we've trope for that, with more generic name. The first time I encounter the trope was over two decades ago in a Wuxia novel by Gu Long.
The trope was launched rather recently, but yes, we do already have it - it's Impersonation-Exclusive Character.
Also agreeing with Michael Katsuro. Put some damn spoiler tags on your stuff, please, it's not that hard.
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Recently, in the mobile game "Dragalia Lost", who we believed to be the character "Harle" for the entire game's run turned out to NOT be Harle, but a demon named Loki who took on his appearance. Not only that, we learned that Loki had banished the real Harle to the other-world.
Isn't that similar to what happened to Alastor Moody in Harry Potter and the Goblet of Fire? Moody was taken by a Death Eater and imprisoned, while said Death Eater impersonated Moody.
Which is what I have come to refer to as the "Professor Moody Hoax", a variant of the "Scooby-Doo Hoax".