tiefling
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A tiefling is a fictional humanoid race introduced by the Dungeons & Dragons tabletop role-playing game. They are described as "human-based planetouched, native outsiders that were infused with the touch of the fiendish planes (typically devils)"
They are essentially demon girls and boys. They typically have e.g. horns and a tail, and atypically colored skin (e.g. red, pink, purple, or jet black).