Marnie is a young girl from Spikemuth that uses Dark-type Pokemon. She joined the Gym Challenge in Galar with the goal of becoming champion and putting her hometown on the map. She wants to take over as the gym leader in Spikemuth to replace her older brother, Piers. Marnie has a faithful fanclub by the name of Team Yell that follows her wherever she goes to battle. She likes fashion, sweets, giving gifts to others, cheering people on, and her brother Piers.