The story "And The Executioner Wore Stiletto Heels" features Two-Tone, a pair of brothers (one white, one black) who essentially form a single, two-headed mob hitman.In The Incal and The Metabarons, there are Janus-Jana, the Sacred Androgyne and Emperoress of the Galaxy.A pair of twins - the left one, Charity, is an angel, the right one, Vanity, a devil.
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At the end, Buffy put holy water in the sprinkler system, then activating it, killing every vampire in the casino - including the brother. The brother is a vampire, and the sister is a good shot with her guns, making them a potent enemy.
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In the Buffy the Vampire Slayer: Origin comic, Buffy fights a set of opposite sex conjoined twins who are running a casino-cum-vampire factory in Las Vegas.Castle Waiting: A pair of conjoined twins are billed as a two-headed girl at a circus (as the owner thinks that's more interesting than two girls joined at the waist).There's a Nightwing villain(s?) that is two men who were fused together by some sort of toxic goo.1950s comic stories published by EC Comics often featured conjoined twins, usually revealed in a surprise twist ending.Much later in the story, the group meets two conjoined demon brothers who are at war with each other. In Inuyasha there was a tribe of harpy-like bird demons whose leaders were two twin brothers sharing the same bird-like lower body.The sisters Raphaela and Luciella end up turning themselves into this in Claymore.
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Conjoined Twins are a real phenomenon, and have been around pretty much forever.