Madeline is a somewhat headstrong girl who doesn't particularly care about school, but loves Duel Monsters. After the millennium earring was stolen from a museum by a robber, she stole it from the robber for herself. The authorities just let her keep it because she was a kid and you can't interfere with magical destiny lol. She's quite charismatic and confident, perhaps overly so, but she has a good heart despite her recklessness. After Kiri came to Domino City, the two bonded over their millennium items and became fast friends. Kiri has actually learned a lot about duel monsters from Madeline.