Cerveau is a skilled Reploid engineer who plays an essential but quieter role in the Resistance. As the creator and fixer of weapons and equipment, his technical expertise is crucial to the efforts of Zero and the entire Resistance. He is deeply dedicated to his work and his colleagues, particularly Ciel and Zero, whom he cares for deeply.

Though he is not directly involved in combat, his contributions to the Resistance’s efforts are indispensable. Cerveau’s role in assisting Ciel with her research into Cyber-elves and the Ciel System is vital for advancing the Resistance’s goals, and he is portrayed as highly intelligent, meticulous, and dependable.

Tone: Cerveau’s voice should be soft-spoken, warm, and slightly reserved. He should sound like someone who spends most of his time deep in thought, analyzing problems and finding solutions. His tone carries a natural kindnes.
Delivery: Gentle, thoughtful, and patient. Cerveau speaks with a measured cadence, as if he carefully considers his words before speaking. His voice should never be forceful or commanding—he's not a fighter, but rather a support figure.

There aren't any vocal references that I can find, but I'd imagine a deeper voice for him like that of a middle-aged adult.