a human boy with a fragile heart but with remarkable intelligence, he made a mechanical heart to survive, but in the process became cold & driven by ambition, which resulted in his own death. His appearance has short brown wavy hair, along with brown hair and a cruel look. he was thought to be incredibly intelligent. However, his ambition also clouded his judgment, as his desire to grow ultimately led to his demise. Despite being cold-hearted, he greatly cared for his sister Francoise. 