Anata

Anata (あなた) is a man with blond hair who plays the drums. He takes Drum Lessons with the Samurai Drummer. Anata also appears in the Studio if the player chooss to listen to selected tracks (in which case Anata will simply drink coffee as the music plays) or to drum to the music.

Backstory
Anata is a hypothetical image of the player as a drummer. Pretty straightforward, isn’t it?