Ryu☆ (中原龍太郎, Nakahara Ryutaro, born on October 1, 1979 in Fukuoka, Japan) is a composer for KONAMI's Bemani series of rhythm games. Other pseudonyms he's frequently found under are Ryu* (used until he composed Be quiet), 青龍 (Seiryuu) (used for the songs waxing and wanding and Time to Air), HHH (when collaborating with VJ Halka and dancer Dai) and Kraken (used for the song Do it!! Do it!!).
It should be noted that he is referred to as simply Ryu as well.