WHITE

Natsuki is the original of the two sides. He is a cheerful, happy person, who love anything that cute. It doesn't matter if it's a person - stranger of friend - or if it's a little mascot keychain. He is very affectionate towards the people that he find cute, and very friendly towards his friends - and to most people that he meet.

He believe that he is a master chef, however, it's quite the opposite. The people who eat his confectionaries, treats and cooking tend to almost die of food poisoning, pass out and such, because whatever he make taste so incredibly horrible.

He don't remember the times that Satsuki take over, because Satsuki was born to protect Natsuki.

BLACK

Satsuki is the other side, who was born from a trauma in Natsuki's past, to defend Natsuki. He show up once Natsuki take off his glasses.
He is a very violent person, who have sent over 50'000 people in the hospital. He is also very strong at fighting, in opposite of the other of the two. He does not accept people throwing things away on the street, and might even punch you if you don't put the trash in the trash can. Of course, if you have trouble with that, he might help out. By throwing you into the trash can as well. He isn't really impressed by the things that Natsuki call "cute".

He is, however, very talented at composing music, and has been called a "genius" at composing. He has no qualms getting up on stage interfering with another artists (HAYATO's) live show's, and taking over, either.