Age: 14 (TV series), 16 (Gaiden), 17 (Kikoutei and Message)
Birthday: June 9, 1973
Astrological Sign: Gemini
Height: 167 cm/5’5″ (TV series), 175 cm/5’9″ (Message)
Weight: 58 kg/128 lbs (TV series), 61 kg/134 lbs (Message)
Armor: Halo: Virtue
Seiji (or Sage in English) is possible the most mature of all the Ronin Warriors. He is very proper and speaks in formal Japanese. He hates to be lied to and despises evil as well. He is very calm and in control of his feelings, mostly since he is so mature. If he is pushed, though, you better watch out since he will be driven by blind rage. Since he is a user of the sword, he loves kendo. He loves anything related to swords period. He loves cycling, the bamboo flute, and bonzai as well. He prefers not to speak to girls.