Katherine Hall

Tsukasa Oyashiki works at Issei Tenkai's mansion. She also works at "Dansweets", a culinary program where she sings, dances and makes cakes together with Tenkai. She apparently becomes unable to see her surroundings when dancing.

Early life
Oyashiki was abandoned by her biological parents at Tenkai's doorstep, so he took care of her and raised her as his own daughter. She occasionally tried to mimic his skill in kitchen to a variety of success. She worked hard in the kitchen and on their show, Dansweets, as a means of expressing her gratitude.

IS-7 Incident

 * Main article: IS-7 Incident

During Tenkai's final cooking competition, 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, and when she came back, she heard a huge crash coming from Tenkai's room. Oyashiki investigated the room and found the body of Isaku Hyōdō, after Yutaka Kazami murdered him. Seeing the "PH" sign, she immediately recognized who he was. She left to inform the authorities, but by the time she returned, the body was gone.

Fearing that her sclupture in Hyōdō's room might be destroyed by the police when they investigate them, she transpoted all of them to the house cellar, one by one, disguising them in the tea trolley table with her table cloth.

This caused the forging of the autopsy report by Bansai Ichiyanagi and for Manfred von Karma, in order to use it against Tenkai. Since the body had been hidden away by her, Tenkai was only charged for being an accomplice. When Tenkai was put on trial, she stood by him, but in the end he cracked under the pressure and confessed.

This, of course resulted in von Karma's first penalty and the beginning of the DL-6 Incident

Attemped murder of Yutaka Kazami

 * Main article: The Inherited Turnabout

With the help of Shigaraki, Oyashiki was able to save up money to buy the Dansweets masion back and turn it into museum hosting the works of Paul Holic, her favorite artist and craftsman. However, while putting up the display, she finally came to realize that the body was still encased in ice, preserved. Realizing that only she and the true killer knew where the body was, she advertised the grand opening of the museum and set a trap, so that anyone who tried to retrieve the corpse would be overcome with poisoned gas. However, Kazami went to Pisces sculpture instead of Gemini. When that failed to get the killer arrested right away, she dumped the body in the fountain so that it would thaw and finally reveal to the world that Isaku Hyōdō never left the scene of the crime after all, and clear Tenkai's name.

Aftermath
18 years later, Miles Edgeworth, with the help of Tateyuki Shigaraki were able to solve the case, and found about Oyashiki's doings during that incident. She was charged with tampering the crime scene. But she was really happy that Tenkai's innocence was finally proven. She cries happily with Shiragaki smiles for her.

Tenkai even says to her that it's now his turn to wait for her release.

Personality
Oyashiki is polite to a fault, and is always eager to play the generous hostess. She can, however, also be a bit overdramatic. In the past, she had the appearance of a cute lively little girl. She loved Tenkai, her adoptive father, alot as her original parents have abandoned her. While the present day Oyashiki has a more mature look, inside, she is still the girl from 18 years ago.

Design
In present day, she wears a similar green dress with roses adorned in front. Her hair has also become much longer.

Name

 * The kanji 屋敷 mean resident or mansion.


 * The kanji 敷 mean blanket or table cloth, reference to how she hid the body.


 * Her full name is a pun on o yashiki o tsukasadoru (お屋敷を司る) which means "[to be] responsible for the residence". She takes care of Tenkai's mansion.


 * Her surname Oyashiki may be pun on Okashi, which means sweet.