This is Ruka. Ruka is the youngest of a trio of catgirl idols themed around the three times of day. Ruka is themed around the nighttime, a mischievous imp illuminated by the moonlight in her smile. Ruka is a prankster and troublemaker, with a love of seeing people's explosive reactions when they are fooled. Though Ruka can be a problem child, she has mastered the art of acting innocent, knowing how to bat her eyes and lower her ears just right to stay out of trouble. Ruka is a complete social misfit. Though she's interested in cute things like bunnies, ponies, and dresses, she puts people off by her equal fascination with bugs, zombies, and the occult. Ruka is seen as a weirdo by many, causing trouble for her older sisters by association. However, when performing as an idol, Ruka is capable of acting the part of the ideal younger sister, resulting in her being the most popular idol of the three. Ruka expresses her love for others by how willing she is to tease and prank them, and she pranks her older sister Luma more than any other. However, she never pranks Dawn, as she has a great deal of respect for her oldest sister.