Eiichi is an idol with a high sense of self-importance, yet he believes he's pathetic if he isn't above everyone else. He's emotionally manipulative and tends to ignore the concept of personal space. Despite this, he's responsible and cares for those who are close to him, and blames himself whenever someone he cares about gets hurt. He's overly zealous, and tends to shout "good!" when he's excited or satisfied. He's incredibly passionate about music, and always strives to improve.