Arunolt was an attractive young man, resembling his cousin Tsukiyama as well as his own siblings. Compared to his brother Nathanael, Arunolt sports a slightly longer hairstyle.
He was responsible of his sister, sacrificing his own life to save hers.
Ten years prior, Matsuri Washuu and other Ghoul Investigators attacked the home of the Rosewalds. While their father stayed behind to save them, Arunolt fled with his mother and siblings. After the death of their mother, the brothers sacrificed their lives to protect Kanae.
Before Kanae's name change, he was known by Arunolt as his sister Karren. As an elder brother, Arunolt was protective of her, eventually sacrificing his own life to save her's.