Ren is quiet, friendly, responsible, and conscientious.   He values tradition and does not adapt well to different situations.  He's very straightforward in speaking and in opinion, and seems to have a sense of aging behind his youthful eyes.  Although he's young, he is experienced and speaks with a sense of self worth.  Skeptical and independent, has high standards of competence and performance - for himself and others around him.

Ren has a soft voice, but it's wise and firm- Think Kyoya Otori, Nagito Komaeda.