A 20-year-old man who was born without a tongue and cannot speak. Consequently, he communicates through facial expressions and gestures. According to those around him, he occasionally suffers from seizures. Despite originally being a servant who poured wine, he is highly intelligent and quick-witted. He has mastered all the card techniques taught by the Count—which are less about fair play and more about high-level cheating and deception—and uses them freely. Almost every gambler describes his skills as nothing short of genius. He is a bold, witty, and bright individual who overcomes crises with quick thinking, yet he is simultaneously cunning. He seems to have excellent proficiency and physical abilities. It is best to view him as a multi-talented person. As a side note, he is handsome. This is mentioned by those around him, and others often fall for him or call him beautiful when he disguises himself as a woman.

Eugene's mentor, who works quite well in sync with him. While traveling across France to gather information regarding the 'Twelve Bottles of Milk' incident, he met Eugene, and they now travel together to dig up information through fraudulent gambling. He uses elegant, aristocratic vocabulary and possesses a personality that allows him to navigate crises smoothly. He does commit betrayal from time to time... well, that's not the issue right now.