- Full Name?: Madilynn Paige Janvine Endethaw
- Nickname?: Madi
- Gender?: Female
- Age?: 16, going on 17
- Eye Color?: Dark Brown
- Hair Color: Red
- Other Details?: She has freckles.
- Family?: Marielle (Twin), Brother (Name Unknown), Mother (Name Unknown), Father (Name Unknown)
- Friends?: Brendan, Chrissy (possibly used to be, or still friends), Alex, Kai, Luis (possible), Stephanie, Abyss (possible)
- Enemies?: Brendan (Marielle), Scrappy Doo, Cassie, Matt
- Relationships?: None
- Alliances?: Stephanie, Chrissy
- Fears?: As Madi's first line, she's not afraid of anything.
Madi's design consists of her having red, slightly wavy hair with a teal headband propped on top. She has an silver army necklace, given by her older soldier brother. She has a sleeveless t-shirt with white and light purple-pink stripes. Her original design consists of her hacing short, blonde hair. She has slightly dark blue eyes, and black framed glasses. She has a denim jacket, with a black sweater under.
- Her twin, Marielle, is shown to be violent and crazy, but can be cranky if she doesn't accomplish something.
- Marielle assisted with Alex to outshine Brendan, which failed, and there might be a possiblity that Marielle has a crush on Alex.
- Madi was one of the people who pranked another contestant on Totally Teen Island.