| Character Information
Addy, also known as Addison, is a girl who Lisa befriended.
Lisa met Addy in the library where they bonded over their interest in the book series Gallop Girls. Addy later invited Lisa to her birthday party. When Lisa arrived at Addy's house, she found that Addy was rich as her father was the supplier of ketchup to stadiums and mega churches. Lisa then went out with Addy where she found that Addy's family owned horses. Lisa and Addy rode the horses for a bit until they encountered Bella-Ella, Sloan and Tessa Rose, Addy's other friends. The three girls came across as stand-offish with Lisa and seemed mean to her, but Addy told Lisa they were nice once you got to know them.
Back in the house, the girls gave Addy presents. Addy received sunglasses and a phone case from the other girls, whilst Lisa gave Addy a horse toy. Addy's other friends teased Lisa over giving her a toy and Addy joined in mocking Lisa for it. Later in the party, Addy and her friends watched the show Thank God I'm Dead, which Lisa was afraid of. Addy then joined her friends in mocking Lisa over her fear of the show.
When Lisa was hiding away in the caterer's toiler, Addy found her and told Lisa that the other girls were mean to her but now that she had Lisa, they could be mean to Lisa instead, and Addy could join in. She then told Lisa that next time, Lisa should bring another kid with her so Lisa could join in being mean to that kid and Lisa would become part of the squad. Later that night, Lisa called Grampa but got through to Bart instead. Bart agreed to come pick Lisa up but instead helped Lisa to get revenge. Lisa dipped Addy's hair, along with her friends hair, in horse hoof hardener. When Addy and her friends woke up, their hair broke off and Bart and Lisa fled on horseback.
Addy and her friends caught up with Bart and Lisa and they wanted to destroy them on all social media. Lisa then got through to Addy over their love of Gallop Girls. Addy then helped Lisa, pulling the strings on the other girls vests, causing them to inflate and fall off their horses. Lisa then told Addy to go with them, but Addy told them that she wouldn't as this was her house. Addy then called Lisa her best gift.
- Episode – "The Hateful Eight-Year-Olds"
- Episode – "Homer's Adventures Through the Windshield Glass" (opening sequence)