Karen is a character from the 2023 anime film The Klutzy Witch: Fukka and the Witch of Darkness. She holds the title of princess of Green Castle and is depicted as a young woman with long blonde hair that reaches her waist, complemented by blue or green eyes. Her typical appearance includes wearing earrings and a dress.

Within the story, Karen serves as the best friend of the protagonist, Fukka, who is the princess of Silver Castle. She is also a childhood friend of Chitose, the prince of Blue Castle. While Fukka is portrayed as lively and prone to causing trouble, Karen provides a contrasting presence. She is described as gentle and patient, often acting as the calm and level-headed member of the trio.

Karen's primary motivation is to support her friends. When Fukka accidentally breaks a seal of darkness and is transported to a spooky amusement park, Karen willingly follows to help her complete a series of tests and defeat the evil witch. Her key role in the narrative is that of a harmonizer. The headstrong natures of Fukka and Chitose lead to conflict, and it falls to Karen to find a path to harmony, allowing the three of them to work together effectively.

Her relationships are central to her character. Her bond with Fukka is one of unwavering friendship, as she accompanies the clumsy apprentice witch on a dangerous quest. Her dynamic with Chitose is that of a long-time friend who must often mediate between him and Fukka. Unlike the protagonist, Karen does not appear to be an apprentice witch herself; her role is defined by her personal qualities rather than magical training. The film does not focus on her personal development, but rather establishes her as a consistently patient and stabilizing force whose actions are crucial for the group's success. Specific details about her background before the events of the film or her own magical abilities are not provided within the available information.