Rui is a teasing and intelligent man who is interested in robotics. He despises vegetables and would do anything to avoid eating them. He has a cat-like smirk commonly. He has purple hair with cyan streaks. His eyes are a golden yellow. He's considered strange by most, but he's kind to those who stick around. He's bisexual with an implied crush on Tsukasa Tenma. He's a good engineer and robot maker, but he sometimes forgets to care for himself. He works at Pheonix Wonderland with his friends.