Rinrin

Rinrin is the mechanical genius of the sisters and is always hard at work with her inventions. Early on, one of her creations that we meet is Mecha-Rinrin, a giant robot that usually accompanies her. She definitely has a talent for machines and anything mechanical as she makes messenger phones, a submarine, and is even in the process of creating a robot replica of herself. In Sister Princess Repure, she teams up with Yotsuba to form a detective duo to find out details about their big brother that they don't know. U…