Hiiro Amagi

A newcomer who has no knowledge whatsoever about the idol industry, yet aims to be an idol. He has an optimistic, naïve personality who tends to overdo it with how passionate he is. He is Rinne Amagi's younger brother. He has a side of him that causes him to get ahead of himself and follow his emotions over logic. He sings from the heart, making his performances powerful and clear.

(Source: Ensemble Stars Wikia)

He appears in episode 24.