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Guildenstern (ギルデンスターン) is the self-proclaimed greatest Genma scientist. He is responsible for the creation of many of the Genma soldiers that the heroes have fought throughout the Onimusha trilogy. Servant to Fortinbras and a high-ranking demon that has lived since ancient times.

Onimusha: Warlords

In Onimusha: Warlords, he appears several times to talk with Samanosuke Akechi and tries to kill him using one of his demon creations like Reynaldo or Marcellus and Marcellus S. He doesn't fight himself, preferring to destroy his foe using his numerous creations. Throughout the game, Samanosuke and Kaede will come across a series of books written by Guildenstern, where he explains such things such as the resurrection of Nobunaga Oda, other humans making similar deals with them like Genghis Khan and Alexander the Great, categorizing different types of demons, and the sacrifice of Princess Yuki for the Dark Ceremony. No one knows what happens to him after the defeat of Fortinbras.

Onimusha: Blade Warriors

Guildenstern returns in Onimusha: Blade Warriors where he creates and sends various creations to the human world, including Marcellus at the Three-story Pagoda and Ancient Castle (Flame). He's seen shouting at Marcellus in the Ice Chamber.

Onimusha 3: Demon Siege

He also returns in Onimusha 3: Demon Siege, with two missions. His first job is to work on the Timefold machine. This machine can control time itself. His master Nobunaga ordered him to work on it so he can go into the future to rule over all the world and even time itself. Guildenstern also wants to create the ultimate and most powerful warrior of all the time to destroy Samanosuke. He then decides to use Ranmaru Mori to be this warrior. The scientist is then defeated by Samanosuke when they battle in the Zoo de Belogne stage.


  • While he does not appear in Onimusha 2: Samurai's Destiny, he is referenced through notes. He is also responsible for the creation of the Golden Evil Statue that Jūbei Yagyū fought and destroyed in the game.
  • Guildenstern is a character in the famous Shakespearean drama, Hamlet. Most Onimusha villains are named after the characters of the play of Hamlet.