Ren Ichinose (一ノ瀬レン Ichinose Ren) is a 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.
While Nana Komatsu is pregnant with Ren, she thinks he's a girl, thus nicknaming the child "Sachi", but Ren Honjo offers the name Satsuki which is given to Takumi and Nana's second child. Ren was named after Ren Honjo, the lead guitarist of Trapnest and previous bassist of Blast. Ren is often mistaken by readers to be the second child as while still an unborn child he was referred to as a girl but he is Nana and Takumi's first child.
Ren's appearance is very similar to Nana's which causes speculation as to whether Ren really is Nobu's child, since Satsuki resembles Takumi without question.
Personality and traits
He acts more grown up than his age. Naoki commented that he probably has a high IQ.