Katherine Hall

Tsukasa Oyashiki was a servant who worked at Issei Tenkai's mansion, as well as being his program partner on the musical cookery television program "Dansweets". After Tenkai was arrested for murder, Oyashiki worked as an actress until she could afford to buy back his mansion and turn it into the 12 Constellations Art Gallery, which she became the curator of.

Early life
Oyashiki was abandoned by her biological parents at Tenkai's doorstep on Christmas Eve, so he took care of her and raised her as his own daughter, giving her the name "Oyashiki" (meaning "resident or mansion") since he found her in front of his mansion. She occasionally tried to mimic his skill in the kitchen to a variety of success. Oyashiki worked hard in the kitchen and on Tenkai's show, "Dansweets", as a means of expressing her gratitude. She also became a fan of Paul Holic, a sculptor working in France.

IS-7 Incident

 * Main article: IS-7 Incident

During the finals of a cooking competition Tenkai was holding at his mansion, Oyashiki was asked by Tenkai to take polaroid photos of everyone's work. She was delayed when she had to leave and find extra film. When she came back, she heard a huge crash coming from Tenkai's room. She investigated and found the body of Isaku Hyōdō. Seeing the "PH" design on his ring, she immediately realized that he was Paul Holic. She left to inform the authorities, but by the time she returned, the body was gone.

Fearing that the sculptures in Hyōdō's room might be destroyed by the police during their investigation, she transported all of them to the house cellar, one by one, using a makeshift tea cart formed from a table cloth and baggage lift. She then claimed the reason for the statues melting was because she had tripped over the refrigerator wires as she was taking pictures.

Tenkai was accused of the murder, and Gregory Edgeworth took on his case with Tateyuki Shigaraki acting as his assistant. Edgeworth soon discovered that the victim's body had gone missing, thus raising questions concerning the autopsy report that the presiding prosecutor Manfred von Karma had in his possession. Von Karma was able to force a false confession from Tenkai, which made Edgeworth's defense near impossible. However, he told the court that the autopsy report must be a fake, and since there was no body, Tenkai was only able to be charged as an accomplice. This resulted in von Karma's first and only penalty, and the beginning of the infamous DL-6 Incident.

After Tenkai's conviction, Oyashiki was kicked out of his mansion by his relatives. She swore that she would buy the mansion back, and so eventually became an actress to earn enough money to do so.

Attempted murder of Yutaka Kazami

 * Main article: The Inherited Turnabout

Eighteen year later, with help from Shigaraki, Oyashiki was able to save up enough money to buy Tenkai's mansion back and turn it into an art gallery dedicated to the works of Paul Holic, her favorite artist. However, while putting up the sculptures he had hidden all those years ago, she finally discovered what had happened to Hyōdō's body; it had been frozen inside the Gemini sculpture!

Realizing that only she and the true killer would know where the body was, she made a big show of advertising the grand opening of the gallery so as to set a trap for the culprit; anyone who tried to retrieve the corpse would be overcome with a poisoned gas triggered upon opening the top of the sculpture's case. She put the Pisces sculpture in the Gemini's place, and waited for the culprit to reveal themselves. Sure enough, Yutaka Kazami, one of the competitors in Tenkai's competition and the person that she suspected, took the bait, but managed to escape before the gas did too much damage. Oyashiki then dumped Hyōdō's body into the gallery's fountain to thaw in order to finally reveal to the world that Isaku Hyōdō never left the scene of the crime after all, and clear Tenkai's name.

Resolution
Miles Edgeworth (son of Gregory Edgeworth) was present at the gallery with Tateyuki Shigaraki during Oyashiki's plan. Miles figured out Oyashiki's past and present actions, as well as Kazami's crime. However, upon hearing that Kazami could no longer be arrested due to the statute of limitations expiring on the IS-7 Incident, she began thinking of another drastic way to prove Tenkai's innocence, only for Shigaraki to stop her by pointing out to Miles a loophole in the rules on statutes of limitation. This allowed Kazami to be convicted and Tenkai freed, much to Oyashiki's joy.

Oyashiki was charged with tampering with a crime scene and attempted murder, but Shigaraki offered to be her defense attorney and promised that he would do all he could to make sure she was not prosecuted for her crimes. At that, Oyashiki finally smiled for the first time in years with tears in her eyes and happily accepted Shigaraki's offer before being reluctantly placed under arrest by Detective Dick Gumshoe. A freed Tenkai later stated that it was now his turn to wait for her, as she had been doing for him for all those years.

Personality
Oyashiki was polite to a fault, and always eager to play the generous hostess, but could at times be slightly over-dramatic (possibly a remnant from her time as an actress).

She greatly admired Tenkai for looking after her when her biological parents had abandoned her. So devoted was she, that she was willing to murder the person responsible for framing Tenkai, and it was only via the accidental intervention of Larry Butz that Kazami was not killed. Oyashiki was also willing to take the law in her own hands again when initially told that Kazami could not be arrested for his crimes, due to the statute of limitations for the IS-7 Incident expiring, but was once again prevented from doing so, this time by Shigaraki informing Edgeworth of a loophole that allowed for Kazami to be finally brought to justice.

Name

 * Her full name is a play on the Japanese phrase "o yashiki o tsukasadoru" (お屋敷を司る), which means "[to be] responsible for the residence". This fits well with her job.


 * The kanji (屋敷) in her surname mean "resident or mansion" (explained in-game as Tenkai naming her after where he found her), but may also be a play on "Okashi" (お菓子), which means "sweet" or "candy". "敷" by itself means "blanket" or "table cloth" - a reference to how she moved Hyōdō's body.


 * Her English name in the fan translation of Gyakuten Kenji 2 is "Katherine Hall", which is likely a pun on "catering hall", in-fitting with the chef theme.

Development

 * She is Motohide Eshiro's favorite Gyakuten Kenji 2 character.


 * Her age is erroneously noted as 36 (rather than 34) in the unofficial English patch of Gyakuten Kenji 2.