Yukako Yamagishi

"It doesn't matter if anyone comes, because love is invincible."

- Yukako Yamagishi

Yukako Yamagishi (山岸 由花子) is a supporting character in Diamond Is Unbreakable. She is featured centrally in the Yukako Yamagishi Is in Love and the Yukako Yamagishi's Vision of Cinderella story arcs.

Besotted with Koichi Hirose, Yukako also appears as an ally among the group agreeing to watch for the killer terrorizing Morioh.

Appearance
Yukako is a teenage girl of fine build, 167 cm (5'5¾") tall. She is characterized as especially beautiful (noted by Aya Tsuji ), with fine facial features and bodily proportions. She has full, dark, wavy waist-length hair; a mole above her right breast and dark eyes. In the anime, she also tends to have somewhat prominent eyebrows.

Like most characters in Part IV, she is only seen wearing a dark sailor fuku, a pair of leather shoes and socks, while displaying mature taste in casual clothing.

Personality
Yukako is introduced in the midst of a date with Koichi Hirose, initially acting demure and sweet around him. She calls herself ugly when waiting for him to respond to her confession, and presumes this is why he is hesitant to respond. This visage quickly dissipates when she reveals her bad temper and obsession with him, which occupies the majority of her initial role in the story.

Aloof and "insanely tough" (as described by Koichi), she is cold toward people and often maintains a steely, unwelcoming expression on her face. She is highly irritable, and is prone to lashing out, particularly when something gets in the way of her obsession. When angered, her left eye twitches. With her Stand, she is able to act upon her intense possessiveness towards Koichi, becoming violent towards any who she feels would hurt her chances of captivating him. This takes an overtly psychopathic turn when she decides to kidnap him and attempt to brainwash him into reciprocating her feelings. Upon Koichi's escape, she goes completely berserk and is willing to ruthlessly attack him in order to keep him for herself. Once she is defeated, and then immediately saved by Koichi in spite of what she put him through, Yukako sees the error of her ways, becoming genuinely infatuated by his heroism, and as such begins to fully respect his privacy and feelings.

She is later shown to be watching him from a distance, but is highly fearful of approaching him in the event that she may scare him. During her trials brought upon by the mysterious beautician Aya Tsuji, Koichi actively seeks out Yukako and says that he wants to move past their fight and begin their relationship anew, and ends up ultimately reciprocating her feelings of love. After this, she appears much more mellow and relaxed.

Despite the insecure comments in her introduction, she has shown immense pride in her appearance and hair, even threatening to murder Koichi once he damaged her hair during their fight, and threatening Aya after her Cinderella caused Yukako's face to fall apart. She is shown to be a very good cook and sewer, traditionally feminine traits. She also seems to possess some level of knowledge in engineering, being able to construct a functional electric chair from household objects. In the anime, she has a habit of referring to herself in the third person. She has stated she likes men with potential rather than perfect people, whom she considers boring, and admits outright to becoming obsessive about anything she likes.

In terms of archetype, Yukako may be described as yandere. Araki comments that her personality was designed in reaction to the prevalency of moe perfectionism applied to many female characters, as a statement that someone of any gender should be capable of being frightening or losing their temper.

Abilities
Yukako's Stand is Love Deluxe, lending versatile, prehensile life to her long hair; enabling her to spontaneously extend it, grasp heavy objects securely, and strike, smother or infect human targets.

Yukako Yamagishi Is in Love
Yukako is introduced in the midst of a date with Koichi Hirose, when she quickly confesses her admiration for him. When he dithers in his response, she becomes aggressive. Later, she jealously attacks a girl she believes to be a potential rival.

In response to false rumors muttered by Josuke and Okuyasu in order to put her off Koichi, she kidnaps him; attempting to indoctrinate him and "change him into a better person".

When Koichi resists, she soon threatens his life, forcing him to fight against her. During a tumultuous battle, Koichi heroically saves her life as she accidentally falls off a cliff.

People of Morioh Town
Later in the story, Yukako is warned about Yoshikage Kira after Shigekiyo Yangu's death and advises everyone to be careful.

Yukako's Vision of Cinderella
Yukako, still lovestruck, seemed to have learned from her mistake in trying to force Koichi. Unhappy about her unrequited love she made use of the services offered by Aya Tsuji's beauty-enhancing Cinderella Stand, which rendered her into a bewitchingly attractive woman in the eyes of Koichi - for a price and a certain time limit, during which she was to use a special lipstick in order to uphold the "magic", i.e. the Stand's power. The Stand allowed her to grow closer to Koichi, who, after some trials and tribulations, warmed up to her and willingly became her boyfriend.

However, when she forgets to apply the magic lipstick, her face becomes deformed and she flies into a rage at Aya, who grants her a chance for her to return to her original appearance should she be able to pick her original eyes. Yukako has trouble picking the right one until Koichi arrives to her aid and decides that he will pick for her, but requesting that Aya take away his eyes should he make a mistake. Aya, unwilling to take the role of an antagonist, decides to give Yukako her original appearance back. Following this, Koichi and Yukako share a tender moment and the two presumably become a couple afterwards.

Janken Boy Is Coming!
Yukako also makes an appearance in Janken Boy Is Coming while sitting at Cafe Deux Magots with Josuke and Okuyasu.

Goodbye, Morioh Town
Yukako last appears to bid goodbye to Reimi Sugimoto.

The Book: 4th Another Day
(The information below derives from a Light Novel not written by Araki. As such, it may or may not be consideredcanon.)

Yukako was Chiho Futaba's neighbor when they were kids. She helps Koichi find Hanae Orikasa's killer, a student with red marks on his arms. Suspecting the killer might be in the same class as them, Yukako traps their class in the classroom so Koichi could rise the temperature with a word made by Echoes, making the students take of their jackets. Unfortunately, the killer wasn't in there.

Eyes of Heaven (PS3/PS4)
Yukako makes her first video-game appearance in Eyes of Heaven as a playable character. She was confirmed alongside Koichi, who appears as her main tag-partner.

Her moveset primarily consists of melee attacks with her hair.

Her GHA has her wrap the opponent in her hair before flinging them around, slamming them into the ground three times before raising them extremely high up into the air before launching them into the ground one more time hard enough for them to bounce.

Tournament
She is paired with Hol Horse in the Eyes of Heaven Tournament, but was eliminated in the preliminaries by Jotaro Kujo and Vanilla Ice.

Gallery
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Trivia

 * According to JOJOVELLER, her first chapters could be a reminiscence of the horror film, Misery.
 * Her Stand's ability, the manipulation of her hair, is very similar to that wielded by Bruford.
 * Yukako is the first female ally in the series to wield a Stand.
 * An image of Yukako from Chapter 350 is featured on the limited edition cover of Base Ball Bear's 2009 single "Breeeeze Girl", as well as on billboards for its promotion..
 * Some illustrations of Midler in Heritage for the Future are based on depictions of Yukako.