Arima Teppei's former name is Kobayashi Teppei. His parents died in a accident and died he planned to have revenge but was stopped by Arima Isshin. He was adopted by his grandfather Arima Isshin . Arima Isshin gave Fujikura Yuu as his own personal maid.
He is a teenager with black hair and dark blue eyes. He often wears normal clothing, on parties he wears a tuxedo, at school he wears uniform.
He is kind person but sometimes he's a pervert. He is the reason the Houjouin is now at peace with the Arima Group because he is now in charge of the Arima Department Store.