- Nakamaru Yuichi Maru: Beatboxer. Jokester. Koki's best friend.
KAT-TUN is undoubtably one of the most popular japanese bands today and perhaps in all history. They're incredibly popular with young girls and can be seen in advertisements all over Japan (TV, posters, flyers, handouts, etc.)
KAT-TUN is amazing and defies definition -- they have truly made it "WORLDWIDE" (KAT-TUN fans will get this.)