Tetsuya

 a stay at home roommate  of paris , who  does charity work sometimes.

 he  enjoys his catty side , and living  as a full on cat - and found  that he can be himself with  pari cuz hes quite  fine with entertaining it 

likes to be treated more like a pet   and regresses into this state a majority of the time, making him hard to put up with  .pari found him in this cat like state and decided to take him in, as a companion as first , but it soon grew into a mutual friendship  (with the occasional benefit) with pari appreciating his company   

outside of his cat side  , hes a calm and friendly person, and quite intellegient even .

He at first was shunned for his inability to act more like the other , more human acting members of his family so for good while he was forced to grow up and live on his own.