He is voiced by Naoki Oikawa.
He is one of the sons of the Kuki clan who follows in his father's footsteps as Leader of Oniwabanshu. During his childhood, he and his adopted brother, Tohma, were taught swordsmanship by their father, who was a legendary samurai with two powerful swords. Tohma envied him -as he was their father's son by blood- and killed their father in a jealous rage. His brother left with one of their father's prized swords, Kohroh. Years after his father's death, he receives secret orders to infiltrate Ritenkyo and annihilate the rebellious Razor Trio. Hearing that Tohma is one of their leaders, he departs with one of his father's friends, Jin-Emon Hanafusa, taking the missing blade's counterpart, Sei-oh, in hand.
In his ending, he and his brother engage in battle with Seishiro as the victor. A prideful Tohma tries to attack him again but is beaten again effortlessly. He reclaims his father's missing sword and returns home, continuing the Kuki legacy.
Seishiro is a stoic and intelligent hero, often drawing himself into duels that interest him rather than the ones he's assigned to do. He is a man of few words, and has a habit of sleeping while standing much to the annoyance of those who try to converse with him. Able to anticipate those around him, he is typically out of sync with his surroundings, always expressing an unbiased opinion. This makes him somewhat rude and exceedingly arrogant at first glance. However, he is wise beyond his years and his words often carry some sort of advice to others. His actions exasperate his partner, Jin-Emon, as he tries to act and work alone.
He represents an absolute defensive style (in contrast to Tohma). Many of his attacks, albeit slower, have built-in evade or reversal leaving him with very few openings for his opponent to take advantage of. He also has highest damage output per single move in game, which becomes a dominating factor.
His attacks and special moves are named after water and the moon.
- One's Own Art - Samurai Shodown: Warriors Rage
- The Return - Samurai Shodown: Warriors Rage
- Soul Diver - Samurai Shodown: Warriors Rage
- The Blue Wolf (蒼志狼, Seishirō) - Samurai Shodown: Warriors Rage
- SSWR Cover.jpg
Samurai Shodown: Warriors Rage: Japanese cover art by Shiroi Eiji.
Loading screen image.
- Seishiro promo1.jpg
Samurai Shodown Warriors Rage: illustration by Senri Kita.
- White - Seishiro & Tohma 2.jpg
Seishiro and Tohma.
- White - Seishiro & Tohma 1.jpg
- Seishiro 1.jpeg
- Seishiro 2.jpeg
- Seishiro Tohma Symbols.jpg
Symbols found on Seishiro's and Tohma's backs.
- SSWR Promo.jpg
Samurai Shodown: Warriors Rage: Illustration by Senri Kita.
- SNK farewell.jpg
SNK Farewell poster: Made in 2000.