What is Nano always going on about? I mean like "What colour will you be? COLOURS!!!"

N speaks of colours as of personality. "Stained red" means you have blood on your hands. "Black" is lost in despair, no lighting to define the natural personality.

Back in the lab where he was a lab rat, they changed every little inch of him. So basically, even his brain, genetic code, and thought process. He speaks riddles because everything about him is so advanced, that he see's things beyond anyone else.

Let me know if you need anything else.
I got this understanding from a RIDICULOUSLY amount of time thinking about this game....