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.
by Not Gumby May 03, 2011
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
by imtoolazytocomeupwithanamenow April 26, 2011