Rui lives by his own set of rules, which causes people to consider him a weirdo. He's a literal genius as seen in the Revival my dream event. However, Rui often feels like an outcast for his inventions and his eccentric thinking. In WxS, Rui feels like he can be himself in the group and pushes himself to create better and better inventions.

He likes to tease his friends, and is always thinking up show ideas or inventing things.
He often fake cries to get his friends to agree with things