Battler is the son of [Rudolf](https://anilist.co/character/14043/Ushiromiya-Rudolf) and his first wife [Asumu](https://anilist.co/character/259608/Ushiromiya-Asumu), and is generally considered to be the main protagonist of the series. He is extremely stubborn, and is afraid of "shaky" transportation, fearing he might fall off a boat. At first glance, he appears to be hotheaded, cocky, and even a little perverted. However, he has a heart of gold he isn't afraid to show when the situation calls for it.