This article contains information about Ace Attorney media that has been released only in Japan.

The information in this article comes from a game, demo, or other media that has been released in Japan, but not in any predominantly English-speaking country. The subject of this article has been officially revealed for English versions of this media. English versions of this content are only available through unofficial translations. More information on this can be found here.

If you have personal experience with the item of media in question, you can help the Ace Attorney Wiki by improving on this article. Please heed the manual of style when adding information.

William Petenshy
Image Gallery Sprite Gallery
William Petenshy
"Frailty, ..... thy name is ..... PETENSHY!"

William Petenshy was a fancily-dressed man who, despite his appearance, was actually a criminal. He was first seen having a dispute with a mysterious man near the flats owned by the Garrideb's, and later became heavily involved in an incident the day after.

Time in PrisonEdit

William Petenshy was sent to Manchester Prison for fraud. During his time, he looked after one of his fellow inmates named Selden, who was to be executed but had an illness. Wanting to reward his loyalty, Selden told Petenshy that he had hidden a treasure in his old flat at John Garrideb's complex and gave him the key with which to open the treasure. Petenshy was later released from prison and went to the complex, but the flat on the second floor was already occupied by Duncan Ross. Thus, Petenshy, desperate to obtain the treasure, settled in the flat on the first floor.

Petenshy's lodging

His flat

While he living in the flat, Petenshy developed a way to cheat money on gas. He carved a two centimeter diameter depression in a bar of soap, poured a liquid in it, and set it by the window for it to freeze. They he placed the fake coins, that were the same size and shape as a three pence coin, into the meter to get gas. Once the heat from the meter melted the liquid, Petenshy poked a hole in the coin compartment to let it all out. He also hid the key Selden gave him in a small tin box under the floorboard.

Petenshy plotted to force Ross to leave his flat by blowing into the gas pipe to try and scare him. Unfortunately, Ross died of gasoline-induced asphyxiation instead of fleeing his room, so this led people to believe the flat was cursed and that Ross's death was an accident. Petenshy could not enter the flat, however, because of the investigation of Ross's death. Garrideb would not let him move into Ross's flat either, for he, being unemployed, was behind on his rent by about three months. By the time the investigation was done, Sōseki Natsume had moved into the flat. Petenshy then became acquainted with Natsume, frequently debating with him on topics such as Shakespeare.

A Fiancée's RevengeEdit

Main article: The Adventure of the Clouded Kokoro

Ross's fiancée, Viridian Green, heard about his death and became depressed. She became to suspect Petenshy behind his death after hearing what Natsume was experiencing and remembering a conversation between two gas company employees. Seeking revenge, Green bought strychnine off the black market and sent a letter to Petenshy to meet her at a nearby pub called the Pepper Pavilion, saying that she knew vital information about Ross's death in order to lure him out of his bedroom. He followed the instructions of the note, which allowed Green to put the strychnine in the same lamp line, she also took the key in the tin box. But not long after, she was accidentally stabbed by Joan Garrideb, so Petenshy met with no one at the pub. An investigation was commenced regarding the stabbing, Sōseki Natsume being the prime suspect, so the police Petenshy barred from entering Natsume's flat. Since Sherlock Holmes also took the time police weren't investigating to read Natsume's books in his flat, Petenshy had no reason to fiddle with the gas pipes.


The mysterious arguing men.

During the investigation of said stabbing, Petenshy got into an argument with Decargo Mieterman, who was sent by his boss's wife, Mrs. Altamont, regarding Petenshy's gas payments. Petenshy simply dismissed him calling him Horatio and saying he was old. When Ryūnosuke Naruhodō and Susato Mikotoba come to introduce themselves, Mieterman leaves but says to Petenshy that this isn't over. After revealing to the two that he is Natsume's lodger, Petenshy goes back to his flat.

The Truth of the PoisoningEdit

Main article: The Memoirs of the Clouded Kokoro
William Petenshy was using the same trick that had accidentally caused Ross's death on Natsume. When Natsume appeared in his own flat the night he got aquitted, he brought black tea for them to have, but Petenshy end up using it to make fake coins later. Then the two had a jujutsu battle with Petenshy dressed as Romeo and Natsume dressed as Juliet, Natsume won. After Natsume returned to his flat,
Unconscious petenshy

Did he eat soap?

it was not he but Petenshy who was near death's door, for he fell victim to the poison planted by Green. However, he survived and briefly regain consciousness when Naruhodō and Susato were investigating his flat. He quotes a line from Macbeth and poses, but suddenly he doesn't remember the whole line. So Tobias Gregson tells him, then he faints and is taken to St. Bartholomew Hospital.

Truly thinking Natsume was responsible for this, Petenshy decided to sue him for attempted murder. He thought the best chance of him getting the treasure was having Natsume arrested by saying the tea was poisoned. He was invited by Barok van Zieks to stand as a witness to the trial, he makes a dramatic entrance quoting the same Macbeth quote from yesterday. He and Decargo Mieterman testified about the night and although the jury originally liked him, Petenshy was eventually exposed of his gas stealing crimes. Later that day, he stumbled into Viridian Green's hospital ward by mistake. He comments on her painting and short plumpness which upsets her, he asks for forgiveness since he was poisoned but to no avail. When he sees Naruhodō, he admits he is actually impressed by his defense today, but then says that may not be the same tomorrow and leaves.

The next day, the jury turned on him for being a gas thief. But William Petenshy says the court should really punish Sōseki Natsume for trying to poison him. He says Natsume only put poison in his teacup, not his own. He left with his kettle without drinking any tea due to the debate and Petenshy used that to make the fake coins. That's why no traces of poison was found in them. But Naruhodō notes a ring around Petenshy's teacup and not on Natsume, meaning he drank it in one gulp. Van Zieks says Petenshy used the tea in the kettle and what he said was simply a mistake. Petenshy tells the jury to give their judgement and they actually agreed to vote guilty.

During the second closing argument, Juror No. 3 mentions an incident where an Altamont gas inspector blew into the gas pipe to make sure it's their gas instead of from connecting pipe from another company. With the handprints on the wall and Natsume's experiences in mind, Naruhodō accuses Petenshy of trying to kill Natsume.

When Viridian Green took the stand, Petenshy had to testify on where he was the night she was stabbed, he doesn't officially know Green until now. Van Zieks notes that it's odd that a poor man like Petenshy would go to an expensive restaurant like the Pepper Pavilion. Petenshy is very surprised when Green's attempted murder comes to light, then he notices the key Selden gave him around Green's neck and screams desperately for it.

Petenshy Confession

Petenshy's confession

When Naruhodō says that Petenshy killed Duncan Ross in attempt to get Selden's treasure, he starts to go nuts. He says the treasure belongs to him and demands for time to look for it. He refuses to admit to killing Ross, says there is no proof of the treasure's hiding place. It was there that Naruhodō decides to find the treasure himself, that's when Sherlock Holmes arrives. He says he invented a testing fluid using something a person touched as a sample, which is the key. So what Selden touched in that room is where the treasure is located. In the end, William Petenshy is taken back to prison with the charges of murdering Duncan Ross and attempting to kill Sōseki Natsume. The treasure Selden stole later turned out to be the dog collar of Klimt van Zieks' dog, it was a gift from the Baskerville family upon his marriage to one of the noblewomen.


William Petenshy
Out, out, brief candle, life's but a wandering silhouette.... A poor player that struts and frets his hour upon the stage... and then is heard no more.


William Petenshy wore flashy pink clothing that looks remarkably out of place when compared to those around him. Being a fan of William Shakespeare, he seemed to have a very high sense of self and frequently references the playwright in his speech, as evinced by his calling others "Horatio" and reciting the "sound and fury" soliloquy after being awakened from his poisoning. But underneath his polite exterior is a mad man of a criminal. Petenshy acted very antagonistically towards people, including Mieterman, Natsume, and Green. Although he never intended to kill anyone, he was willing to go with his same original plan with Duncan Ross to get rid of Natsume despite knowing what happened the first time. His favorite foods are simple soups and salads, he calls them dishes of nature, he usually eats only one meal a day.


  • The names of Petenshy and Decargo Mieterman are not given during Dai Gyakuten Saiban: Naruhodō Ryūnosuke no Bōken. However, the title of "Mysterious Man A" is given to Petenshy in the game's artbook, while Mieterman is referred to as "Mysterious Man B".[1]
  • His surname comes from a Japanese word meaning "crook" (ペテン師), which hints at his criminal background.
  • "William" is a reference to William Shakespeare, whom he often quotes.



  1. riku7se. "So I just got the DGS artbook in today" "Dai Gyakuten Saiban: Liveblog and Info" tumblr. Retrieved on 2016-12-08.
  2. 2.0 2.1 Ash (2020-02-08). Dai Gyakuten Saiban 2 - A Romantic Adventure Of Reminiscence With The Development Staff Vol. 3 (2017). Retrieved on 2020-08-07.
Dai Gyakuten Saiban: Naruhodō Ryūnosuke no Bōken characters
Kazuma Asōgi · Taketsuchi Auchi · Beppo · Nikomina Borschevic · Jezail Brett · Robert Crogley · Dmitri Demiglaski · Oscar Fairplay · Joan Garrideb · John Garrideb · Viridian Green · Tobias Gregson · Sherlock Holmes · Satoru Hosonaga · Seishirou Jigoku · Judge (British Empire) · Kuroppoi · Gina Lestrade · Cosney Megundal · Decargo Mieterman · Susato Mikotoba · Yūjin Mikotoba · Mortar Milverton · Ryūnosuke Naruhodō · Sōseki Natsume · Patrick O'Malley · Rola O'Malley · William Petenshy · Piroshko · Adam Redifast · Sanmon Sonohigurashi · Mitrov Stroganov · Nemmy Tinpillar · Tully Tinpillar · Koroumaru Uzukumaru · Taizou Uzukumaru · Barok van Zieks · Hart Vortex · Wagahai · Iris Watson · John Watson · Hatch Windibank
Dai Gyakuten Saiban 2: Naruhodō Ryūnosuke no Kakugo characters
Mrs. Altamont · Genshin Asōgi · Kazuma Asōgi · Taketsuchi Auchi · Balmung · Harry Barricade · Jezail Brett · Maurice de Quilco · Marco di Gicho · Benjamin Dobinbough · Enoch Drebber · Oscar Fairplay · John Garrideb · Gotts · Maria Goulloyne · Viridian Green · Tobias Gregson · Sherlock Holmes · Satoru Hosonaga · Seishirou Jigoku · Judge (British Empire) · Gina Lestrade · Heita Mamemomi · Rumba Marmatch · Cosney Megundal · Elyder Meningen · Decargo Mieterman · Susato Mikotoba · Yūjin Mikotoba · Anna Mittlemont · Everyday Mittlemont · Haori Murasame · Ryūnosuke Naruhodō · Sōseki Natsume · William Petenshy · Duncan Ross · Connette Rozaic · Sandwich · Selden · Courtney Sithe · Mapotov Stroganov · Toby · Barok van Zieks · Klimt van Zieks · Venus · Queen Victoria · Hart Vortex · Wagahai · Iris Watson · John Watson · Hatch Windibank
Community content is available under CC-BY-SA unless otherwise noted.