Tsuyoshi is the strongman of the group; he pilots the Yellow Lion, and wears a yellow uniform. He is roughly 22-24 years old. He may look tough and mean, but he has a soft heart, especially when it comes to children. He is never late for a meal. Though his friends tease him about his appetite, Tsuyoshi is very muscular. "Seidō" is a Japanese word for "copper."
