Eiji is a shy and polite person, which is a surprise since both his father and brother show arrogant and confident personalities. Though appearing somewhat timid at first, he can quickly become very eloquent and confident when discussing music, as it is something he is very passionate about. He cares a lot for his older brother and his fellow members of HE★VENS, and usually attempts to solve any sort of conflict with a calm and rational attitude. He possesses great musical talent, though he may appear as an amateur due to his soft-spoken stature. Eiji seems to get along well with others, as he immediately saw eye-to-eye with his duet project partner Tokiya Ichinose and didn't seem to be bothered by the fact that they are from rivaling idol groups. He holds both Tokiya and his older brother in high regard.