Initially an unnamed mob character with several nicknames, she was eventually given the official name Rukuriri. At first she was given the fan nickname Ushiroda (Ushiro=Behind, Da=Common Last Name Ending) due to the scene (Episode 4, ~10:15-10:45) where she thinks Team Duck was hiding in a garage in front of her, only for them to appear behind her from the floor. When she realizes this, she shouts "後ろだ (Ushiro da)", which means "They're behind us", which also provided the genesis for her fan name.
Tank commander of a Matilda. In a school styled with elegance she has an unusually hot-blooded nature, and her tone of voice is also rude. Supports the front lines with a high degree of competency.
