Rain is one of the protagonist of in the Rain series. He is the general of a small country called Sunkwoll. Due to a dramatic experience in his childhood, he wants to become stronger than anyone else in the world to protect what he wants to protect. He comes off as an aloof, carefree person, but during important matters, he shows great power and responsibility. When the series continues on, the people he meets know the reasons for his behavior and thus trust him, but sometimes make fun of him knowing this. He also wishes to protect Princess Shelva based on a promise he made with her three years ago, but he did not know she was the princess of the country then since she told him then that her name was supposedly Michelle. Even so, he still wishes to protect her.
(Source: Baka-Tsuki, edited)