Gustaf is the prime minister of Hydeland Kingdom who handles political affairs in Vivian's name. He has a feud going on with Count Dean, due to his support to Archduke Macneil.
It is later revealed that he was controlling Vivian by use of a magical necklace. After his treachery has been revealed, he releases his hold on her and escapes with some treasures which includes the Royal Orb. His escape ship however is attacked by pirates and he is assumed to be killed during the raid.
- His design and way of dressing is based on Renaissance portraits such as Henry VII, Elizabeth of York, Henry VIII and Jane Seymour or Hans Holbein the Younger's The Ambassadors.