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A variation upon a trope or story mechanic which, like an isotope of an atom, remains fundamentally the same as the normal version, but may behave very differently.
Common isotropes of Ms. Fanservice include the Vamp and the Femme Fatale.
by Not Gumby May 03, 2011
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The name for variations of a literary trope, a "literary trope isotope".
Although dracula and edward are both vampire isotropes, the dracula isotrope is highly stable, while the edward isotrope has a tendency to decay into fanfiction and ghey
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