Rinrin (鈴凛)
Background
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. Unfortunately, this takes away from really showing her amazing skills as an inventor that are prominent throughout the first Sister Princess anime series and in the original stories.
Like all of her sisters, she really puts her heart into her work, as she wants her brother to be happy. And of course, any help and encouragement that her brother Wataru can give her always puts a smile on her face.