Rui lives by her own set of rules, which causes many to consider her a weirdo. She is almost always smiling and sometimes gets carried away by her eccentric ideas. Despite the apparent riskiness of her ideas, Rui does her best to take safety into consideration. Rui also has levels of curiosity that borderline on obsession, as she loves to take toys and home appliances apart to see how they work. She cares deeply for her friends.