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Bits and pieces I find vaguely interesting on the interwebs.
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"evil-twin
An evil twin is the concept in fiction of someone equal to a character in all respects, except for a radically inverted morality. Symmetric.
If the evil twin is literally a twin brother or sister, it should be combined with the XFN value of sibling.
The evil twin value can be applied to a version of yourself from an alternate universe or timeline. The Star Trek episode Mirror, Mirror contains the canonical example of an alternate universe evil twin. The presence of a goatee beard is often a dead giveaway."
