Lisa is the second-youngest child in the Loud family. She is a prodigy who has already graduated from college with a PhD, and is often working complex on experiments, equations and formulas. She speaks with a lateral lisp and usually wears a stoic frown, but she does smile from time to time.
Lisa has shaggy brown hair and wears large glasses to help her see. She wears a green turtleneck sweater, purple pants and brown shoes, all of which droop down to illustrate her stoic demeanor.