Age in Mobius: 
3rd Year (Age 18)
Age in Reality: 

Kotaro is a nosy boy whose cheerful attitude doesn't fit his large build. He often sets the mood at the Go-Home Club.

Kotaro simply can’t leave people alone if they need help. His favorite words are "love" and "friendship." He has a deep respect for his father and does not hesitate to say that his dream is to become a rescue worker. When you first meet him, he seems like a good guy—bright and energetic—but as time goes on, it becomes apparent that he's a troublemaker.