Schwan is thought to be the sole inheritor of the throne. In his coming of age, he thought he'd be able to announce to everyone that he would dismantle ACCA, however he wasn't able to as Mauve, Jean and the Five Chiefs, put an end to his plan.
Schwan is the son of the youngest princess of King Falke II. After the death of his aunt, the 2nd princess, Schwan was directly thought as the sole inheritor of the throne. When he saw Lotta during his coming of age, he ordered the investigation of her, then later finds out she was his cousin and immediately realized about Jean being a royal member of the family. Schwan wanted to dismantle ACCA and give himself total control of the Kingdom of Dowa. Unknown to him was the fact that Jean, Mauve, and the Five Chiefs knew of his plan and were able to stop him from dismantling ACCA. In Episode 9, Schwan orders the assassination of Lotta as she and Jean pose a threat to this ability to become King. Unfortunately for Schwan, Owl happens to show up and pulls rank on the kidnappers and is able to save Lotta.