Karen Kujo is a vibrant and energetic character in the anime series "Kiniro Mosaic." She is a half-Japanese, half-British girl who transfers to Japan and becomes friends with Shinobu and the others. Known for her cheerful personality and spirited antics, Karen often brings a lively dynamic to the group. Her love for Japanese culture and her sometimes quirky behavior create humorous and heartwarming moments. As a central character, Karen's interactions with her friends highlight themes of friendship and cultural exchange, making her an endearing part of the series.