Lotte is a one-off character from the Doraemon episode "Moving to a Haunted Castle." She's a tall girl with long blonde hair reaching down to her waist, striking blue eyes, and a light gray coat cinched with a brown belt. She's German.
What stands out about Lotte is her genuinely warm personality—she's cheerful, kind, and easygoing. In her only appearance, she ends up leaving an old castle in Doraemon and Nobita's care, but not before hanging out with them. She brings food for the group and spends time playing with them, showing she's the type who actually enjoys helping people have a good time rather than just passing through.
Content compiled by AnimeList.moe from publicly available sources.
