Dead Or Alive

A sweet and polite girl, Kokoro is the illegitimate daughter of Fame Douglas and one of his former mistresses Miyako, making Kokoro the half-sister of Helena Douglas. It is possible that if Helena were to give up her control of the Dead or Alive Tournament Executive Committee, Kokoro would be next-in-line to take control. However, it seems that Kokoro has little to no knowledge of her connection to DOATEC and the Douglas family.

Kokoro was conceived by her mother Miyako while she was a mistress to Fame Douglas, but she never told who her father was.

While Miyako kept her connections with DOATEC as head of the subdivision DOATEC Japan, Kokoro was oblivious to her heritage and was placed in training to be a geisha - a traditional, female Japanese entertainer whose skills include classical music and dance. While she had her heart in her training, Kokoro also gained a love for the martial arts and started to train herself in the art of baji quan as a result.

During the events of the third Dead or Alive Tournament, Kokoro was walking home and saw a passed out high school girl. This girl was Kasumi disguised as a high schooler to keep her shinobi secret from getting out. Kokoro asked her if she needed any help but Kasumi refused despite having a major fever, and fled as she saw Ayane approaching. When Ayane asked her where Kasumi ran off to, Kokoro refused to tell her. Ayane was angered and was forced to fight her. In the end, Kokoro fled as well without saying a word to Ayane.

The Fourth Tournament
At 17 years old, Kokoro started to focus more on her baji quan training and asked her mother if she could participate in the fourth Dead or Alive Tournament. While Miyako was not happy about her daughter's choice, she hesitantly gave her permission but warned Kokoro that she might not necessarily like what would come of it.

During one of her initial matches, Kokoro faced the drunken master Brad Wong, who seemed to take a liking to her. Kokoro, however, was put off by the drunk and vehement fighter and declined his offer for a drink. After several rounds of the tournament, Kokoro met Helena. Unaware that they were related, Kokoro was surprised when Helena recognized her as Miyako's daughter before their fight. It is then that Helena mentions that Kokoro should learn her fighting technique, pigua quan. After the tournament, Kokoro returned to Kyoto where she resumes both her maiko and martial arts training.

The Fifth Tournament
Two years later, while on a business trip to Tokyo with her mother, Kokoro took a stroll through the city and spotted Helena on a monitor announcing the reformation of DOATEC and the return of the Dead or Alive Tournament, which push hope in Kokoro that she will be able to see Helena again. The very next moment, a construction site collapses and during the chaos Kokoro is knocked over by Lisa Hamilton, who she challenges to a fight and demands an apology (unaware to her Lisa was actually lost to Ryu Hayabusa since their fight in the same place). After their battle, Lisa asks the girl how Miyako is doing, implying that the two fighters know each other through DOATEC.

The next few days, Kokoro returned to Kyoto to train for the up-coming tournament, having friendly spars against Jann Lee and Akira. She spots Jann Lee practicing with his nunchaku in a building. Jann Lee throws the weapon in her direction, expecting her to catch it and demonstrate her knowledge with them. Instead, the nunchaku crashes into a vase nearby and she wonders what he did that for. They then spar.

After her fight with Jann Lee, she comes out of the building to the sakura courtyard and continues to practice her baji quan as she is approached by Akira. He demonstrates his own baji quan skills and challenges her to a friendly spar before she is picked up by Zack to go to the tournament.

When Kokoro arrives, Zack takes her to meet Helena and the two of them have a friendly conversation. During their chat, Kokoro asked Helena what kind of man her own father was, implying that Kokoro may know - or as least suspect - that Fame was her father. However, neither woman confirms nor denies the fact and they go on to have a friendly fight.

At the fifth tournament, Kokoro made it to the quarterfinals, but was defeated by Eliot.


The Sixth Tournament
Kokoro was put under Helena's care after her mother Miyako abruptly left, mainly due to evidence implicating her as being involved in MIST. Largely because of this, Kokoro was left depressed. She was then visited by NiCO, who explained she knew her mom and that Miyako was the one who gave her a job. Kokoro, however, drove her off when NiCO empathised with Kokoro's sense of abandonment, although not before NiCO left behind a photograph that piqued her interest: it featured Kokoro and Helena as children, together with Fame Douglas.

She then asked Helena what the photo was about, admitting NiCO's role in supplying it to her. Helena replied that it wasn't NiCO's to give, before reluctantly confirming Kokoro's suspicions that the two shared the same father, and thus were half-sisters. Kokoro did not believe this, and demanded to learn of it from Miyako herself, even fighting Helena and beating her. However, Helena begged her not to go, and admitted that, barring Kokoro, she had no one else in her family left. Kokoro ultimately heeded Helena's request, although she was still despondent over this revelation. She eventually sparred with Zack when he supplied her with an invite to the sixth tournament, feeling better as a result. She also attempted to help dress Nyotengu, although her criticisms and constant redos irritated Nyotengu.