Ren Ichinose

Young son of Nana Komatsu and Takumi Ichinose, although it is not made clear who is his real father or if Satsuki Ichinose is his younger sister or not. He is close to his father, Takumi, and currently lives with him in London, England.

He bears a similar resemblance to his mother, and has inherited his namesake's, Ren Honjo's, talent for the guitar. Reira Serizawa is particularly close to Ren and will only sing, when he is playing.

(Source:Nana Wiki)