Baron Muster (バロン・ムスター), real name Itall Sonann (イタル・ソナン), is a mysterious man and self-proclaimed villain. Once a kind-hearted man, he was driven mad by events which caused him to contract the Maske Tumor disease and his loved ones to die. He is the bitter enemy of Kagura Dornburg, and has spent ten years plotting and executing an elaborate plan of revenge. He uses a poison called the Krista Morten to kill his enemies, and desires nothing more than finding the Secret Treasure of Mars.
Muster is Princess Kagura's bitter enemy.
Muster originally kidnapped Erika. After learning about her past history, he decided to make her his disciple in evil.
Muster and Maruki are allies due to shared hatred of Princess Kagura.
Porwit was murdered by Muster.
Zoe is Muster's bodyguard. Despite his physical abuse towards her, she appears to have Stockholm Syndrom, loving him regardless.
Damjan was tricked into killing himself by Muster.
Prof. Hicham was murdered by Muster.
Muster didn't seem to care much when Prof. Chinmoy died.
- Despite his appearance, Itall is likely only in his early 30's.