Shosei Sakaguchi
Type Human (Alchemist Warrior)
Birthday March 14th (Piscis)
Age 36
Gender Male
Height 6'1" (186 cm)
Weight 176 lbs (80 kg)
Blood Type O
Affiliation Alchemist Army
Occupation Great Warrior Chief (Asian Sector)
Team Team Shosei (formerly)
Kakugane XVII: Buster Baron
Voice Actor Sho Hayami (Japanese)
David Paulson (English)
Status Active

Shosei Sakaguchi (坂口照星 Sakaguchi Shōsei) is the Great Warrior Chief of the Asian Sector of the Alchemist Army.


Shosei is a tall man with gray eyes mostly covered by his glasses which have the amalgam alchemical symbol in between the lenses. He also has blonde medium-length spiky hair with one wavy lock of hair that hangs down the left side of his face beyond his chin. His outfit consists of a large dark green and grey hat which hides his spiky hair, dark green shirt with the amalgam symbol underneath his sleeves, dark green trousers, white gloves and a dark olive cape covered by a dark olive mantle that is connected to his shirt by two square plates both featuring the amalgam symbol.

Powers & AbilitiesEdit

Keen Intellect: As leader of the Alchemist Warriors, Shosei has shown to have keen intellect as he organizes all of his subordinates along with planning the battles against Victor.

Buso RenkinEdit

Buso Renkin of the Full Plate Armor Buster Baron (バスター バロン Basutā Baron)


"The Baron is Undefeatable!!".

Shosei possesses Kakugane XVII which takes the form of a giant 57-meter-tall, 550-ton full plate armored robot. It resembles a gigantic knight, complete with a red cape connected to the robot by two square plates featuring the amalgam symbol resembling Shosei's attire. It is known as the most powerful Buso Renkin around and serves as the most powerful conventional weapon as well. Shosei can command it by standing on top of it or in a control room inside the robot.

  • Buso Renkin Replication: The Buster Baron's main property is to be able replicate and amplify the powers of the Buso Renkin of other Alchemist Warriors who have boarded the robot. It can use up to five Buso Renkin at one time.
  • Immense Physical Strength: Buster Baron has displayed feats of considerable strength, being able to grapple and even overpower Victor's giant form while he was in Stage 3.
  • Immense Durability: The Baron is extremely sturdy as it was able to take a few hits from Victor's giant form and was unscathed even after atmospheric reentry.
    • Busterbaron1

      Buster Baron flying through space.

      Buster Knuckle: A powerful punch capable of punching a hole through Victor's giant form.
  • Detachable Limbs: Shosei can choose to manifest the robot's hands or feet for independent use.
  • Rocket Pack: The rocket pack on its back allows it to fly for short periods of time, using a combination of Hiwatari's Blaze of Glory and Hanaka's Aerial Operator it can even be used as a makeshift rocket, however Shosei usually uses it for charging attacks.


  • According to Nobuhiro Watsuki:
    • He likes peace and ancient traditions.
    • He dislikes those who disrupt peace or ignore tradition.
    • His hobby is collecting sunglasses and praying.
    • His special ability is being able to laugh as he disciplines his subordinates.
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