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Basic Trope: Everyone knows a deep, dark secret about a character... Except the character themselves.
Straight: Alice has a dark past - ten years ago, she unknowingly slaughtered a bunch of innocents, then later forgot due to Laser-Guided Amnesia. Bob and the rest of the Five-Man Band keep this from her.
Exaggerated: Everyone in the Five-Man Band has some deep, dark secret - and each member is the only one who doesn't know their own secret.