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Error!Frisk is the protagonist of ErrorTale and they meet Error!Sans in the Ruins. They were scared of Error at first, and mistakes him for Undertale Sans.
They are the same as normal Frisk but the colors are inverted. They have a Chara eye and a Frisk eye. They have a sweater like Frisk's. They have the letters OR on their cheek instead of Error.
Error Frisk used to be Frisk, so you can tell they would be really nice, but they are very shy and cry a lot. They have a crush on Sans, which would be obvious considering they used to be best friends before they became a glitch. They hang or live with Error Sans, which they might like him, considering he is exactly like their crush. They love the little classic Sans doll, that Error has. They like to play with the doll as they've got nothing better to do.