Biscuit Oriba, also known as "Mr. Unchained," is a formidable character in the anime series "Baki the Grappler." He is renowned for his immense strength, indomitable spirit, and his role as the strongest inmate in the Arizona State Prison. Oriba possesses a muscular build and an exceptional combat prowess, making him a formidable opponent in any fight. Despite being a prisoner, he enjoys special privileges due to his unmatched strength. His character adds depth to the series as he challenges protagonists with his unique philosophy on strength and freedom.