Due to his upbringing by his stepfather Gozaburo, Seto acts like a grown man, despite being only 16 years old. He is an introverted, selfish, possessive and cunning, stubborn person. Self-sufficient and cold, he enjoys no sympathy among Yugi's friends. The most important person for Seto is his little brother Mokuba, whom the boy protects at all costs. Seto is initially the world champion of Duel Monsters, but is defeated by Yugi, who becomes his rival. He's best card is blue-eyes white dragon