The phrase red-shirted lady refers to an unnamed mere mortal identified by her red tank top and orange short curly hair.
She had her first appearance in "Catch as Catch Can "
Quotes[]
Hey! Isn’t it eerie how much that impolite cowboy looked like a robot? (She picks up her sheep and hugs it.)
I'm sorry, girls, but there’s no more candy. A tall metal kid in a-- cowboy costume stole everything.
THAT kid!