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Shimon Aizawa

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Shimon Aizawa
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Shimon Aizawa
Link to the template page

(the name given to this character in Ace Attorney Investigations: Prosecutor's Path, the unofficial English fan patch; click on the question mark for details)?

John Marsh
Occupation Actor
Names in other languages
Japanese (romanization written with the given name first) 相沢詩紋 (Shimon Aizawa)
Biological information
(this is for age comparison purposes, and so may look odd; click on the question mark for details)? 2006
(as recorded in court record profiles and case files) 13 (The Grand Turnabout)
Status (last known) Alive
Eye color Brown
Hair color Black
Height (from official guidebooks) 4'11"; 149 cm
Family Teikun Ō (father; deceased)
Ami Aizawa (biological mother; deceased)
Hakari Mikagami (Cousin-Aunt and adoptive mother)
Friends None mentioned
Affiliates Will Powers (co-star)
Penny Nichols (stagehand)
Debut episode The Inherited Turnabout
Leitmotif "Shimon Aizawa ~ Pointed Age"
Penny Nichols
He's a pretty famous prosecutor, you know.
Shimon Aizawa
But he's not wearing a prosecutor's badge.
Miles Edgeworth
Gah! (He's frightfully perceptive...)

Shimon Aizawa is an actor working at Global Studios. He notably had a starring role in the 2019 movie The Great Monster Borumosu vs Gourdy. Aizawa was one of the suspects of the murder of the president of Zheng Fa.

Early lifeEdit

Shimon article

An article on Shimon Aizawa.

The secret son of Zheng Fa's President Teikun Ō and diplomat Ami Aizawa, Shimon Aizawa's early life was marred by tragedy. By the time he was born, Ami had left her job at the American embassy in Zheng Fa. Ami invited Ō to meet their son at her new place of work, the Happy Family Home orphanage, but Ami could not make it to the meeting. After that, Shimon's father never came to see him. Ami passed away in 2014, leaving her cousin Hakari Mikagami to adopt Shimon. Mikagami raised him as if he were her own and became very protective of the young boy and proud of his achievements.

Murder at the filming setEdit

Main article: The Grand Turnabout

Borumosu vs GourdyEdit


On set.

In 2019, Shimon landed the starring role in the new Global Studios Borumosu movie The Great Monster Borumosu vs Gourdy. Working alongside him on the film was veteran actor Will Powers, who played the monster Borumosu. Shimon played the role of a boy who could telepathically communicate with the monster by drinking fresh milk. Penny Nichols, who was working on set as a stagehand, was told to look after Shimon. The film producers set up a filming lot in the vacant space in front of the Big Tower, where the Happy Family Home orphanage once stood. Around this time, Shimon visited the 12 Constellations Art Gallery to view the works of Paul Holic.


One night, Shimon sneaked out of his hotel room to practice his lines at the lot. He noticed what looked like monster's footprints at the lot, and assumed that they were part of the set. He turned on a heater on the studio roof, but forgot to turn it off as he went back down to practice. Consequently, a flammable can near the heater caught fire, causing a Borumosu head prop to fall. Shimon eventually noticed the fire and rushed back up to deal with it.

He came back down and started recording his practice session. During the recording, Hakari Mikagami called to check up on him, and he lied that he was still in his room. He then noticed the body of President Teikun Ō. He had been crushed to death, and there was a crushed bouquet of lion lilies on his chest. Shimon took the flowers, fearing that their presence would implicate his adoptive mother as he had seen her holding the rare flowers earlier. He also feared that the falling head prop had been the cause of the president's death.




The next day, Nichols found the body and ran to get help, returning with Miles Edgeworth and Kay Faraday to find Shi-Long Lang already at the scene of the crime. Shimon later arrived at the scene and met everyone before slipping out again. He went to the nearby studio trailer, where Powers briefly saw him, to drop off his practice video. He then went to the Big Tower's garbage disposal site, where he was spotted by Detective Dick Gumshoe, to dispose of the flowers. It was here that Sōta Sarushiro drugged Shimon and placed him inside a box so that the garbage pickup would unwittingly take Shimon to the landfill near the Sunshine Coliseum. Sarushiro later retrieved the box and hid Shimon in a refrigerated warehouse nearby.

Sarushiro had intended to threaten Mikagami, who was a judge, into getting Marī Miwa a guilty verdict, but Bansai Ichiyanagi got to her first, claiming to have kidnapped her son when his men had accidentally kidnapped Bansai's own son Yumihiko. Luckily, Edgeworth was able to figure out where the boy was being held, and sent Faraday and Gumshoe to save him. After Shimon was rescued and allowed to talk to his adoptive mother via cellphone, Mikagami was able to give Miwa and Bansai the guilty verdicts they deserved. However, Shi-Long Lang called both of them back to the scene of President Ō's death, as they were his prime suspects.

The truthEdit

Shimon kept trying to hide his actions on the night before the body's discovery by Nichols, but the truth was eventually drawn out of him piece by piece. It was also revealed that Bansai had dug up the "footprints" to retrieve something from the SS-5 Incident, the police department's file name for an incident in which the president was kidnapped 12 years prior. The subsequent reinvestigation of the incident by Edgeworth revealed a recorded message from Ami arranging for a secret meeting between the president and his son. Moreover, the president's will revealed his intention to acknowledge Shimon Aizawa as his son. This shocking revelation was accompanied by another: the president had not been kidnapped at all, but rather assassinated at the hands of Ryōken Hōinbō. The body that had been found in the filming lot was actually the president's body double, whom he had replaced after conspiring with Bansai Ichiyanagi and Marī Miwa to have the president murdered.

With Hōinbō's timely assistance, Edgeworth figured out the identity of the mastermind behind Shimon's kidnapping and the body double's death. Sōta Sarushiro's plot to get revenge on the people who had hurt him was revealed, in addition to his attempt to pin the murder on Shimon. Just as Sarushiro was about to be arrested, another assassin, Shelly de Killer, appeared to dispose of him, but was prevented by the sudden appearance of Ryōken Hōinbō. De Killer agreed not to kill Sarushiro at Hōinbō's request.

Just as Hōinbō was leaving, Shimon called him out for murdering his father. Hōinbō offered Shimon a knife and gave him the opportunity to exact his revenge. However, the boy refused to kill the assassin, having seen from Sarushiro's example that revenge only benefited the one taking the revenge at the expense of others. He would only satisfy himself while causing his mother and friends more pain and suffering. Shimon later conversed with his mother on his role as the main star of the Borumosu film, remarking that it was not a big deal, but that he really enjoys being an actor. Shimon then purchased three lion lilies - flowers that represented a bond between parent and child - two for his birth parents and one for his adopted mother.


Shimon mug


Shimon gives off a very bratty and arrogant vibe, but his perceptiveness gives him a strong advantage against any adult who claims to have authority or tries to intimidate him, even causing Shi-Long Lang to back off. However, his bravado is instantly vaporized in the presence of his adoptive mother Hakari Mikagami, as well as when he is cornered by Miles Edgeworth and his logical faculties. Underneath his arrogant exterior is actually a caring boy who would do anything to protect his mother. He also swore revenge against the man who had killed the father he had never met, but, when faced with an opportunity to make it happen, ultimately decided against it after realizing the real consequences of revenge.

Shimon is often mistaken for an elementary school student due to his fondness for milk, short stature, and youthful appearance, much to his chagrin. He seems to have an interest in confectionery-based art, as seen by his visit to the 12 Constellations Art Gallery to see Paul Holic's work.


  • "Shimon" can mean "fingerprints", "inquiry/examination", or "tutelage", depending on the kanji used. The former two meanings may be a reference to how his blood ties to the real Teikun Ō went on to prove that the murdered Zheng Fa president was only a body double. The latter meaning could be a reference to being under Mikagami's guardianship.
  • His English name in the Gyakuten Kenji 2 fan translation patch is "John Marsh", with "Marsh" possibly being a reference to "Aizawa" (his Japanese surname), which literally translates as "fellow swamp". Considering that Ryōken Hōinbō's given name in the fan patch is "Sirhan" and Shimon's is "John", both may be references to Robert F. Kennedy, more specifically the man who assassinated him and his older brother, respectively.


Shimon's design is strongly based on a cattle motif, due to his role in the movie. He wears horns in his hair, has a backpack with a cow keychain, wears a jacket pattern strongly reminiscent of the hide of a Holstein Friesian breed cattle, a phone with the same pattern, and has the aforementioned fondness for milk.

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