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Shirley is the Loud kids' parental aunt, who first appears in the episode "Picture Perfect".
She first makes a brief cameo in "Picture Perfect", where Luna compares Lincoln's homemade coffee mug to her, in the sense that both look ugly.
Shirley is a very repulsive woman, with fair skin, curly red hair, and a freckle on her left cheek. She wears an olive toned dress with light green spots, three golden bracelets on her right arm, round olive earrings, and pink lipstick.