Karin Kurosaki

is the cynical and sarcastic daughter of Isshin Kurosaki, younger sister of Ichigo and fraternal twin sister of Yuzu.

Appearance
Karin is the dark-haired daughter of Isshin Kurosaki with her straight hair cropped to hang around her face, just above her shoulders. She is more often than not seen in sportswear, compared to her more femininely-dressed sister, with alternative shirts and trainers, giving her more of a tomboy appearance. Her eyes are large and dark and she sometimes wears a red cap upon her head and is seen with a soccer ball in many depictions.

Personality
Compared to her soft-spoken twin sister, Yuzu, Karin is the more authoritative of the two. Karin's tough exterior results from her mother's death; because she could not be useful around the house like Yuzu, she resolved never to cry so that she would not burden her family with her personal troubles.

Karin is a sensible person and will not hesitate to kick her father in the head when she thinks he's acting unreasonable. She initially claims that she believes spirits do not exist, but she can see them just as well as her brother Ichigo can. She can also sense them from great distances, which usually manifests as a headache. In spite of her attitude about spirits, Karin is willing to use her abilities to earn a little cash, such as her position as Karakura Red of Don Kanonji's Karakura Superheroes.

Karin actually knows that Ichigo is a Shinigami and, out of concern, wants to know why he's suffering.

Agent of the Shinigami arc
Karin first appears when Ichigo first arrives home, commenting to Yuzu that she should just leave their father and brother to their squabbling while requesting more food at the table and making fun of Ichigo's powers to see ghosts. She claims she does not care nor believe in ghosts despite being able to see them, much to the dismay of the Plus present in the room at that time. She derides her Isshin for having a poster of Masaki on the wall and talking to it constantly. She warns Ichigo to get away when Fishbone D attacks their family, injuring Isshin and capturing Yuzu. She, along with the rest of her family, except Ichigo, have their memories wiped of these events.

Karin got sick when connecting with Yasutora Sado's parakeet, which had the soul of a young boy inside it. She was the first to realize that the bird was a boy who was dead and was being used by a Hollow to help it murder people. Ichigo says that it was the first time he had seen her cry since their mother had died. She is promptly put to bed in order to rest while Ichigo deals with the Hollow in question who is attacking Rukia. She seems to make a full recover as soon as the boy's soul is sent to the Soul Society. She, Yuzu and their school friend witness Kon running across rooftops while in Ichigo's body, but when Yuzu and their friend say it is Ichigo, she dismisses the possibility and makes the others deny they saw what had happened.

Along with the rest of her family, Karin prepares to take the day off school in order to visit their mother's grave. on the way to the grave she kicks her goofing father down to the bottom of the hill when he begins to really annoy her, showing her aggressive personality compared to her sister, even on the day of their mother's anniversary. She shows her keen intellect when she assumes Rukia and Ichigo are an item because he's at that age. She appears to have been very close to her mother due to the fact she was trying to converse with her at her gravesite, not knowing that Masaki had been eaten by Grand Fisher while with Ichigo so Karin couldn't actually converse with her soul. She is also seen comforting Yuzu while she'd crying by their mother's grave, trying to encourage her into not crying so much every year. She is then fooled by Grand Fisher in the same way that Ichigo had been as a child, with his bait standing over the cliff. She and Yuzu are then attacked and captured by Grand Fisher but are saved just in time by Ichigo just as Yuzu's about to be eaten.

Arrancar arc
Karin later reveals during the Arrancar Arc, that she does, in fact, know that her brother is a Shinigami. She tries, unsuccessfully, to prevent Ichigo from confronting the Arrancar Ulquiorra Cifer and Yammy Riyalgo when they first arrive in the Human World. In the anime, she also has an encounter with Tōshirō Hitsugaya, realising that he is a Shinigami after she convinces him to help her win a Soccer match and when he saves her from a Hollow. She tries to find out where her brother is, but the Captain is also in the dark over Ichigo's Vizard training but he reassures Karin nonetheless.

Beast Swords arc
In the anime, while going to a shop, Karin spots a strange humanoid spirit trying to eat sweets without paying for them. After stopping the spirit and it disappears, Karin finds it again in town. Seeing that the spirit is alone, Karin tries befriend him. After learning that the spirits name is Zabimaru, Yuzu (who still can't see spirits at will) suggests Zabimaru come back to their house for food since he was clearly hungry. There, Zabimaru continues to act bratty, saying he enjoys being by himself, to which Karin says he is being foolish to think it is better to be alone. While trying to entertain Zabimaru, the spirit starts to take a liking to them. After Karin and Yuzu fall asleep, Zabimaru decides to leave. When Karin awakes, she finds Zabimaru arguing with Ichigo. Zabimaru then turns his attention to Karin, saying he's angry Karin brought him to her house and runs away. Karin quickly runs after him. Upon finding Zabimaru, she finds him fighting a dangerous Tōjū. The Tōjū, seeing that he couldn't defeat Zabimaru directly, chose to use Karin as a hostage by knocking her out and force Zabimaru to submit. Fortunately, Renji arrives and the two defeat the Tōjū. Zabimaru then brings Karin back to Ichigo an asks him not to tell Karin about Zabimaru. Upon awakening at her home, Karin asks Ichigo where Zabimaru went. As Ichigo pretends not to know, Karin realizes that Zabimaru was fine and decided to return home.

Powers and abilities
Spiritual Power: Not much is known about Karin, but she is able to at least see spirits like her brother Ichigo can (prior to him obtaining Shinigami powers). Tōshirō Hitsugaya also mentions, in the anime, that Karin has high spiritual power for a Human, as she is able to see him.

Enhanced Strength: As demonstrated in the anime, her kicks were strong enough to hurt weak Hollows.

Keen Aim: Karin is also talented at soccer which would strengthen her physical power. She defeats weak Hollow's by kicking a soccer ball at them.