Tobias Gregson
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Tobias Gregson was a Scotland Yard detective working in London during Ryūnosuke Naruhodō's time in England. Due to his role in the Professor case, Gregson became known as a legendary detective. However, he began to take cases on alone, secretly.

Working for Vortex Edit

Main article: The Professor Killings

Tobias Gregson helped Hart Vortex frame Genshin Asōgi for being the Professor. He collected a group of thugs together and attacked Asōgi, stealing his trademark ring. Second, Gregson, with Vortex’s help, would argue for Klimt van Zieks’ autopsy report would not be done to a noble with the House of Lords.

After that, he helped Vortex bring a curse on Barok. Gregson would investigate defendants who went free and come up with best ways for Britain's notorious assassin, Ann Sasha, to eliminate them.

Hart Vortex decided to eliminate Gregson being having Genshin's son, Kazuma, kill him. Since Japan and England recently made a treaty, Vortex knew if Kazuma was fully exposed of killing Gregson, England would have difficulty arresting the young Japanese man. Unfortunately, Vortex's plan went wrong as Kazuma was knocked out by Nikomina Borschevic, sparing Gregson for some time.

 Meeting Naruhodō Edit

Main article: The Adventure of the Clouded Kokoro

Detective Gregson first appears to Ryūnosuke Naruhodō and Susato Mikotoba after the won their first trial in London. He reveals why Barok van Zieks is called the Grim Reaper and invites them to meet their new client, Sōseki Natsume. At the crime scene on Briar Road, Gregson gives the two a map of the the road. He considers one of the witnesses the most reliable in London due being a policeman. He doesn't believe Natsume isn't a criminal capable of capital punishment and he loathes Sherlock Holmes for taking his case and calls his stories mockeries. Later, he receives a card with five shillings from Iris Watson. He is excited that he gonna be put in her stories.

Tobias is the first witness to take the stand, he explains the case. He says it the visibility on the site was good despite being foggy. Sōseki Natsume and the assault victim were the only ones there. When Natsume fled, he dropped his books he got from the secondhand bookstore. By finding out who owned those books, Scotland Yard arrested Natsume. Gregson adds a photograph of the victim stabbed on Briar Road. But Naruhodō reveals that a receipt found in Natsume's flat says he bought the books at a bookstore named Ragged Books. Ragged Books is just a few rows of units from Bourbon Books, but it's so small Scotland Yard didn't think Natsume would buy books from there. Eventually, Natsume's landlady was revealed to be the accidental culprit.

Second meeting Edit

Main article: The Memoirs of the Clouded Kokoro

Third meeting Edit

Main article: The Adventure of the Unspeakable Story

Tobias Gregson receives a telegram from Hatch Windibank to come to his pawn shop regarding a circuit. When he arrives he sees young man pointing a gun, he confiscates his coat and disc for Scotland Yard despite the protests of Gina Lestrade. Gregson mentions an incident but refuses to talk about it. Eventually, the detective gives Lestrade back the coat and Holmes reveals that he actually gave Gregson a caramel mold of the disc.

Later, when Hatch Windiback was murdered, Tobias Gregson investigates the shop with the police. Gregson mistakes Iris Watson as being another witness, hired the best doctor in London to work on Holmes when she shot at the crime scene. Iris gives him some tea and Gregson says this case is simple with conclusive evidence. Naruhodō asks why Gregson acts so different around Iris compared to him, he says it's because she has him as a character in "The Adventure's of Sherlock Holmes". Holmes said Gregson was the smartest in Scotland Yard, but the inspector is jealous of Holmes' character in the novels compared to him. Gregson relays a message to Naruhodō saying Susato went to the High Court of Justice so Naruhodō and Iris decide to go there.

Later, Tobias Gregson gets the written request of the defendant, Gina Lestrade, and some more of Iris' tea. He leaves to continue the investigation allowing the three to check the storage vault.

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Faced with a return Edit

Main article: The Return of the Great Departed Soul

Tobias Gregson took Gina Lestrade under his wing to become an inspector.

Death, confusion, and resolve Edit

Main article: Twisted Karma and His Last Bow and The Resolve of Naruhodō Ryūnosuke

Tobias Gregson found Everyday Mittlemont pretending to be a street vendor named "Hugh Boone" and began to use him by giving him his police ID and asking that he make a scene where he was directed to go to by proclaiming that the detective is here to investigate. In exchange, Gregson paid Mittlemont a lot of money, which allowed him to continue his ruse, this was all for Gregson to better hide his movements.

While Gregson sent Mittlemont out to be a decoy with the "Red-Headed League", a small-time scam of Maurice de Quilco and Marco di Gicho, he was given a “Death Bringer” mission for October 31st, aboard the S.S. Balabrock as it head for France. The target was Seishirou Jigoku, and the assassin sent with him was Kazuma Asōgi. Before he left his secret room to go there, he spoke fondly of Lestrade, and left her his "detective spirit". 

While on board Balabrock, Gregson revealed the truth about Genshin's death to Kazuma. This cause Kazuma attack him, chipping his blade in the process. But then he decided to leave a that, disembarking in France to stay the night. But Jigoku didn't know Kazuma Asōgi was alive and had already decided to kill Gregson on his own to complete the assassination exchange program. When Jigoku returned to his room, he found Gregson there. He body slammed Gregson, knocking him unconscious, but as first class cabins are surrounded by guards, he decided to wait until the emergency drill later that evening to do the final deed. Unfortunately, just as that time arrived, Gregson woke up and started attacking Jigoku in a frenzy. In a moment of panic, Jigoku used the gun the English government had given him in his exchange program sixteen years ago and shot Gregson.

He took Gregson’s coat off and hid his body in the freezer, trying to buy some time and fake Gregson’s time of death. He then put Gregson’s body in his own suitcase and took him off the boat and to the hotel, as there was no chance to throw the body overboard due to all the guards.

Dead Gregoson

Tobias Gregson's death.

He had heard about Gregson’s secret room with Everyday Mittlemont from Hart Vortex, and went to drop the body off there. He set up some firecrackers he bought from Venus and used the candles as a makeshift timer that would go off when the body warmed up. That way, when Mittlemont came to visit, he could be framed. Unfortunately, Barok van Zieks showed up on his investigation of detective Gregson and he took the fall when de Quilco, di Gicho, and Mittlement arrived instead. Maria Goulloyne did the autopsy on him and she notice that the fish and chips in his stomach were moldy.

Personality Edit

Tobias Gregson was a hard working detective who took pride in the Scotland Yard's name. As for being a devoted worker, he despised criminals and lawbreakers. Whenever he met with Ryūnosuke Naruhodō and his co., he spoke in distaste for the foreign attorney, but overall treated him as a citizen respectfully. However, because Naruhodō is foreign (or an attorney), he did not go out of his way to help them with an investigation with the exception of Iris Watson's presence. His favorite food is Fish and chips which is rarely ever seen without.


Tobias Gregson is Dai Gyakuten Saiban: Naruhodō Ryūnosuke no Bōken's version of the Inspector Gregson from the Sherlock Holmes canon.


  • Gregson is one of two characters in the Ace Attorney franchise to die in a game that is not their debut appearance, the other being Jezail Brett. Both were introduced in Dai Gyakuten Saiban: Naruhodō Ryūnosuke no Bōken and died in its sequel.