Unoffical Chaos;Head thread

 Spoiler

1: Suwa and Hazuki were members of the Church, and porters, giving them the ability to use Noah II's power. If I recall correctly, Takumi, or was it Shogun? explicitly stated that Suwa was being corrupted from having too much power.
2: Probably with where Nanami really lives.
3: Rimi is a self-made delusionary existance. That's why she can relate to Taku so well. Rimi was imprisoned by N.O.Z.O.M.I. for as long as she knows, constantly tortured so she could awaken and they could take her 'CODE' sample. She couldn't take it and made the delusion of suicide, killing off her personality, and a new one was reborn to take its place. This cycle continued on constantly until the original Takumi saved her by showing her the sky and giving her a reason to live. (Coincidentally when she awoke and wasn't needed to be tortured any longer, I believe) This part of the story was explained with the spotlight. Where the spotlight shone showed Rimi and Rimi alone, but outside of it was a mountain of corpses of the past her, and nothing else in the world.