Itto is the leader of the Arataki Gang, a little boodle of guys doing... things together.
He's very noisy and childish sometimes, but he has a golden heart and a fearless spirit. He may not be that responsible, but when someone dear to him needs help he's always there.
Kuki is his deputy, she's the person that often brings responsibility and common sense to the gang, is better to don't make her mad. It may seem that she's the mood breaker of the group, but she sees the gang as a family.