Hummy is first introduced as the chosen songstress to sing the Melody of Happiness. She is a bit of an naive and airhead, making her rarely sad or unhappy, and not even shocked when she meets Siren as an enemy. She is very positive and can get rid of a bad thought in minutes. She tends to say "meow" (ニャ nya?) alot, a nod to her cat-like appearance. In the past Hummy was Siren's friend. Even when Siren become their enemy Hummy still believed in their friendship.