Azusa describes him as having green hair and even greener eyes that resemble her father's.
Makoto was caring and comforting unless you tried to get into his ex-boyfriend's pants.
Azusa is Makoto's cousin whom he invited to Japan. He generally offered her as much help as he can and always tried to comfort her and make sure she's okay. This changed dramatically when Azusa developes a crush on Haru, Makoto's boyfriend, and started to threaten her. He returned to his comforting personality again, though, when Azusa is assigned to the mental hospital, so it's unknown if it was just a facade or genuine concern for her.
Makoto and Haru did form a relationship during Chlorine Grown Roses, however, they did break up on chapter 26, because "it was really awkward".
Chiasa is Makoto's cousin. Despite her hate towards Azusa, she didn't seem to have any ill will against Makoto and left him be.