Captain Sagara is not really a supporting character I guess... he was instrumental because he helped shape the man Sano becomes, and he is the catalyst behind many of Sano's actions. He was the Captain of the Sekihoutai, a fighting force formed by former farmers fighting for the Imperialists. The Imperialists promised lower taxes and then revoked that promise. When people got angry they let the Sekihoutai take the fall calling them liars and a false army. This could not have been farther from the truth. The Imperialists then murdered the entire fighting force. Only Sano and another young boy (Sano was very young) survived. Oh, he is brave, capable, and has high ideals, but he also understands reality. He is very intelligent and concerned for others.
I put him in here because I like him ~_^ he's hot!!!