Nakamaru is the beatboxer of KAT-TUN and has beatboxed in most of KAT-TUN's songs/concerts. He's also the oldest amongst the members.
Fans call him Yucchi, Nakama, Maru or Yu. Because of that, when he went to the first Johnny's audition and Johnny-san called out: "Hey, YOU!" in English, Maru thought: "How does he know my name?!"
Together with band mate Koki he's part of the comical duo called "TaNaka". Besides that Koki and Maru are also best friends in private.