Madeline is the protagonist of Celeste, where she climbs Celeste Mountain, a fictional version of Mount Celeste, while dealing with issues such as anxiety and depression. She meets several characters along the way, including an older woman who calls herself Granny, an explorer from Seattle called Theo, a part of herself known as Badeline, and a spirit named Mr. Oshiro who owns a decrepit hotel. As she climbs the mountain, she runs into various obstacles, including Badeline, who attempts to deter her from climbing any further. Madeline helps Theo through Mr. Oshiro's hotel, and later Theo helps Madeline deal with an anxiety attack while riding a gondola that breaks down, telling her to imagine a feather floating up and down. She later attempts this method when Badeline is trying to discourage her further, causing Badeline to send her down. Madeline eventually makes up with Badeline, and they work together to reach the summit. After this, they return to the base, and Madeline makes a pie using her collectable strawberries for all of the other characters.
When TowerFall, an earlier game by Maddy Thorson, was ported to the Nintendo Switch, Madeline and Badeline were added as playable characters.
