Lisa Hill is a substitute teacher at Willy T. Ribbs Middle School. She debuted in the episode Home School, filling in for the unseen Ms. Eckhart, who was absent due to childbirth. Ms. Hill is known for her cutthroat attitude which intimidates the student body.
Ms. Hill grew up in Smithville, California and attended Willie T. Ribbs Junior High where she once dated Penny's uncle Bobby; who took her to prom in high school. After their breakup, things went south for both her and Bobby, as Bobby dropped out of college and moved back in with his mother while Hill eventually ended up homeless where she squatted inside of the school. Penny broke into the school in a highly equipped stealth suit to retrieve her cell phone after leaving it behind when she discovered Hill living in the teacher's lounge. She breaks the news to her friends who she begs to keep it all a secret only for Dijonay to snitch to Ms. Hightower, resulting in her firing. Penny feels responsibly and invites her to live in her family's home, where she takes over with her brazen attitude. Penny (with the help of KG and Zoey) raise over 1,000,000 dollars just to get her out of her house and back onto her feet. She and Bobby then get back together and ride off into the sunset.