Lotte is a character of Doraemon who only appeared in the episode which entitled "Moving to a Haunted Castle".

Lotte is a tall girl with long blond hair that is near to her waist level, silk blue eye color and wears a light gray coat with a brown belt in the middle of the coat. Lotte is from another country which is Germany.

Lotte is a kind, good natured, cheerful and warm individual. As seen in the episode entitled "Moving to a Haunted Castle", she comes back to the castle and leaves the castle to Doraemon and Nobita. She brings food to his friends and plays with them to have fun.

(Source: Doraemon Wiki)