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Should Opposite-Sex Clone actually be listed as a form, here? The definition given on this very page states, "Doppelgänger, with an umlaut and a majuscule, is the German word for a ghostly double of a living person or more commonly simply a word for someone looking exactly like someone else, i.e. an impostor or double."
The fact that an Opposite-Sex Clone is not the same sex as its "parent" by its very nature would preclude them from being a person's Doppelgänger.
Case in point, absolutely no one would confuse X-23 for Wolverine.
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How well does it match the trope?