As of songs,in my opinion the best one is Otsukimi Recital(Moon-viewing Recital).I just Love it.The way it decribes the fact that Momo cares about Hibiya(maybe like a younger brother),i think its very cute,especially when Hibiya blushes at last after holding Momo hand.
I like Kisaragi Attention too.I like both of Momo's songs as u can see i m a fan of Momo,but not only Momo i like all the Kagerou Project Characters.Somewhat i like Hiyori the least,well,i don't really know what others think,though.
There are other songs like Children Record,Mekakushi Code,Kūsō Forest,Tōmei Answer and some...

MOMO KISARAGI- Momo is member Number 5 of the Mekakushi Dan. She is the younger sister of Shintarō and a popular idol, which greatly disrupts her normal life and causes a lot of stress for her. Unlike her brother, she does badly at school, and is too quite a clumsy yet cheerful girl. Momo's tastes are also shown to be rather strange. Her songs are "Kisaragi Attention" (如月アテンション?) and "Otsukimi Recital" (オツキミリサイタル?, lit. Moon Viewing Recital).

When Momo was younger, she was constantly overshadowed by her brother Shintarō causing her to yearn for attention....

Hibiya is member Number 8 of Mekakushi Dan. He is mentioned to be mature for his age, and is shown to have an immense, unrequited crush for Hiyori. He joins Mekakushi Dan after being spotted escaping the hospital he was at after an accident. His songs are "Kagerou Daze" (カゲロウデイズ lit. Heat Haze Daze) and "Otsukimi Recital" (オツキミリサイタル lit. Moon-viewing Recital).

He is the youngest member of the group at 12 years old and has the "Eye Focusing" ability, meaning he can see distant objects from an aerial view. He is originally from a village in the countryside and...