Rei Tsukumo is a self-professed string-puller who keeps doing things in a suggestive manner. Rei does not want sympathetic eyes falling on him. Because of this, he does things in a suggestive manner added with his mastermind-like speech to hide his weakness and un-coolness. He is also a bit of narcissist, and comments on his own suitability as Nanako Watase's pretend boyfriend.