Isshin Kurosaki

is the biological father of Ichigo, Karin and Yuzu and as such, head of the Kurosaki family. He runs their private clinic, the Kurosaki Clinic. A skilled doctor, Isshin can perform almost any medical procedure except major surgery. Initially, Tite Kubo wanted to portray Isshin as a mortician, rather than a doctor, because Kubo thought Isshin looked better in a black suit.

Appearance
Isshin as a doctor is ussually seen wearing a white lab coat. Beneath it he wears a yellow dressed shirt with an orange pattern on it. His shinigami uniform is that of a normal one only that he wears what appears to be captain's haori that is worn like a sash over his left shoulder. However it has no visible division insignia.

Personality
In the beginning of the series, Isshin is portrayed as a silly, fight-loving father who is "extremely over-energetic" and takes a keen interest in what his children are doing, but does it either offensively or with an all-too-happy tone, which elicits comical reactions from his kids, usually in the form of a kick. Because his kids choose to keep to themselves, he doesn't know what they are doing. Mainly Ichigo, but Isshin feels that since he's a boy, Ichigo doesn't need to be watched over as much as his twin daughters. Isshin also seems to enjoy making fun of Ichigo and has a tendency to talk to the large memorial poster of his late wife Masaki, which he has pinned up in their kitchen, whenever he feels particularly emotional. Isshin is a big fan of Don Kanonji's TV show.

Despite his outrageous guise, however, Isshin can be serious and grim at times. On the date of Masaki's death, Isshin smokes a single cigarette in front of her grave, since she thought it made him look cool (she said it when they were dating). He reflects that it was the first and maybe the last time she ever complimented his appearance. He also told Ichigo that he shouldn't blame himself for his mother's death because she gave her life to protect him. In addition, during his confrontation with the Arrancar Grand Fisher and the subsequent chat with Kisuke Urahara, he remains completely serious (aside from a short argument between him and Kon about his parenting, and another, albeit short, between him and Urahara after the latter likens him to his son).

He also reveals to Kon that he has been aware of Ichigo's Shinigami activities and Kon's substitutions since Grand Fisher's first attack. He also notes that he has never called Kon "Ichigo" while Kon is in Ichigo's body and that the travelling charm he gave to Ichigo before he went to rescue Rukia was actually for Kon (it's a protection talisman). This shows the sensitivity and propriety that he possesses of his role as Ichigo's father, which is rarely portrayed in the series.

Around Karin and Yuzu he still remains a goof. His explanation for why Ichigo was gone was that he was "PREPARING FOR MATING SEASON!!!!" to which Karin coolly responded, "That's called puberty, Dad." He has very random stories of his life. While Ichigo was gone he calmly had a flashback of his life during puberty. During this flashback he was seen as himself chibi formed wearing a school uniform and yelling at the sunset, "I'M A MAN!"

History
Little is known about Isshin's history, except that he was once a captain-level Shinigami, though his division is currently unknown. Twenty years before the main storyline, he ceased being a Shinigami, although it is unclear whether he officially quit his duties at that time or on an earlier date. His current Shinigami uniform retains a captain's robe, but it has no visible division insignia and is worn like a sash over his left shoulder. After leaving the Shinigami, Isshin lost most of his powers.

Isshin also shares a relationship with Ryūken Ishida not unlike that of their sons. When Ryūken discovers his son is missing, Isshin pays him a visit and the two chat about their respective styles of parenting. It is then revealed that Ryūken was aware of Isshin's status, and he comments on Isshin's powers. The Bleach Official Animation Book VIBEs states that the two have some prior history together, and that they have been acquaintances for quite some time. It can also be noted they are both doctors: Isshin runs a clinic while Ryūken runs a hospital. It was hinted in volume 1 that the two cooperate on a professional level.

Isshin appears to be an associate of Kisuke Urahara and possesses knowledge of Sōsuke Aizen's alliance with the Menos. He mentions in his conversation with Urahara that he encountered Arrancar about ten years before the main storyline, though they were nowhere near as complete as Grand Fisher was.

He married Masaki Kurosaki and they had three children: Ichigo, Karin and Yuzu. Masaki later died at the hands of Grand Fisher, who was a simple Hollow at the time, six years before the main storyline. Isshin was unable to prevent Masaki's death and blamed himself for it; later in the series, however, he eventually kills Grand Fisher, both protecting Kon (inhabiting Ichigo's body) from attack and finally avenging his wife's death.

Agent of the Shinigami arc
Isshin plays the role character since early in the story, often attacking Ichigo or annoying his daughters. In the first episode it appears that he has no clue what is going on in Ichigo's life since he didn't know that more and more souls had been talking to Ichigo, something that Ichigo had told his sisters.

After a major car accident, Isshin is overheard on the phone arguing with a hospital employee who is refusing to transfer the overload of patients. He says that the employee should tell his boss that Kurosaki needs a favour and then beds will open right up, then slams the phone down. When Ichigo asks if he can help, Isshin tells him to hide in a corner so that he would not be in the way.

Later, after Karin is protected from a Hollow by Yasutora Sado she gets Isshin so that he can help the injured Chad. Chad is however gone and Isshin speculates that Karin lied about the injured man so that she could spend time with him and rips open his shirt for Karin to jump into it, Karin however only kicks him and calls him an idiot.

Arrancar arc
When Ichigo has his first school day after the summer vacation Isshin notes that Ichigo is not wearing his talisman that he gave him at the start of the summer when he he left for his "trip". When Ichigo says that he does not need it, Isshin quickly sews it to his cloth.

When the Grand Fisher is about to attack Kon in Ichigo's body the talisman Isshin gave Ichigo is thrown in between the two creating a barrier in between them. Isshin then appears dressed as a Shinigami and berates Ichigo for not wearing the talisman although he told him to where-ever he went. He then addresses the Grand Fisher as "Mr. Hollow" and says that Ichigo is not home and suggest that he "plays" with him instead When the Grand Fisher questions who he might be, Isshin apologize and introduce himself. Hearing the name Kurosaki the Grand Fisher realizes that Isshin is the father of Ichigo. Isshin confirms this and throws the talisman to Kon and adress him as Kon. Kon then asks how long he has known as Isshin reveals that he has known since the beginning when he saw him enter Ichigo's body in the graveyard and notes how he has never called him Ichigo whenever he was in Ichigo's body.

When the Grand Fisher realizes that both Ichigo is the son of a shinigami and therefor the real thing he notes how he finally understand how he lost to him but also states that he has no interest in Isshin and that he only came to kill Ichigo and orders Isshin to hand him over. Isshin however reveals that he does not know where Ichigo is because Ichigo is no longer a kid and that he had always been very relaxed with the rules in his house to which Kon notes how he is very strict with Yuzu and Karin resulting in Isshin trying to explain himself in a very comedic fashion. He then explains that even if the Gran Fisher has no interest in him he himself came to kill the Grand Fisher.

The Grand Fisher only begins to luagh and questions if they believe that he is nothing but a regular Hollow and proceeds to reveal his "Resurrección" Kon looking shocked says that it is greater than the Menos only to insult the Grand Fisher and for Isshin to reveal that he was an Arrancar a Hollow who had removed his mask to gain Shinigami powers. The Grand Fisher draws his Zanpakutō says that the size of a sword shows the amount of power someone may have and says that Isshin can't win with his twig sized sword. Isshin only smiles and challenges the Grand Fisher to give it a try and draws his own Zanpakutō and the two clash. He kills the Arrancar with a single cut from his sword. Isshin states that all captain-level Shinigami know how to compress their Zanpakutō; otherwise all captains of the Soul Society would be swinging around swords the size of skyscrapers much like the Grand Fisher was doing and tell him to remember; never to judge an opponent by the size of their Zanpakutō. He then calls him a kid and says that he should not talk about a Shinigami's strength until he could understand that.

Urahara then appears, and begins talking about Isshin's powers returning, asking what it's like to be a Shinigami again after twenty years. When asked if he'd had his revenge, he replied that he never really held a grudge against Grand Fisher, but still regrets that he was not there on that night so many years ago when Masaki was killed. Isshin and Urahara discuss the Vizards, touching on Ichigo's involvement with them, and the Arrancar. They note that Grand Fisher was by far the most perfect they had seen up to that point. They question whether or not the Vizard would take the side of Sōsuke Aizen and his alliances or not.

Later when the Shinigami Rukia Kuchiki needs a place to stay, she lies to Isshin, telling him a sad story about how she has lost everything - a yarn that both Isshin (seemingly) and Yuzu buy, resulting in Isshin screaming emotionally to the big poster of Masaki that they now have a third daughter.

Hueco Mundo arc
When Ichigo leaves for Hueco Mundo, Isshin visits Ryūken at the hospital, commenting on what a horrible father Ryūken is and also accepting the fact that he himself is a horrible father. He was able to get into the underground training spot even though Ryūken mostly hid it. His old friend is genuinely surprised that Isshin has regained his powers, while Isshin notices that Ryūken still smokes despite being in a hospital.

Powers & Abilities
When Isshin first appears in his Shinigami form in the anime, he hints that his abilities are on par with those of a captain-level Shinigami. He implies he was once a captain. This is further alluded to by the fact that he has a captain's haori draped over his left shoulder, using it as a type of strap or cape. It is unknown what the extent of Isshin's Shinigami powers are (in Zanjutsu, Kidō, Hakuda, and Hohō). However, while he has not yet regained his full power, he was powerful enough to bifurcate Grand Fisher before the imperfect Arrancar realized it. Furthermore, the fact that Kisuke Urahara (a fellow former Gotei 13 captain) looked to Isshin as his superior implies that Isshin, at full strength, is a very powerful combatant.

Keen Intellect: While normally appearing goofy and oblivious in his daily life, Isshin has proven to be a highly intelligent man. He has repeatedly shown able to see the truth in any situation placed before him as he immediately realized Kon while in Ichigo's body was not Ichigo and was immediately aware of Ririn, Kurōdo, Noba in the anime, and Kisuke's presence. Isshin has also shown to be a very knowledgeable as he already knew about the situation with Aizen and the Arrancar. He is also quite crafty as after discovering his son's new status as a Shinigami, Isshin began making preparations to aid his son which included regaining his own Shinigami powers and protecting Ichigo's body with a Kidō spell.

Expert Hand-to-Hand Combatant: As shown from his repeated comedic attacks on his son, Isshin is a very skilled fighter even when barehanded, further emphasized by how he personally played a part in training Ichigo. However, it would appear that Ichigo has long since surpassed Isshin from how Ichigo usually ends up beating his father. Although, since it's now known that he is at least a captain-level Shinigami, he could be holding back to avoid harming Ichigo, considering Ichigo initially wasn't strong enough to fight Shinigami captains.

Master Swordsmanship Specialist: Only seen fighting once and for a few seconds, Isshin's skill in swordsmanship, despite being rusty, allowed him to effortlessly slice through Grand Fisher's giant Zanpakutō without losing any visible momentum and still cut down Grand Fisher in the process with only his sealed Zanpakutō.

Immense Spiritual Energy: As a former Shinigami captain, Isshin possesses a considerable amount of spiritual energy. His spiritual energy is so great that even when not at full power, Ichigo and Shinji were able to sense its strong presence from miles away. As Isshin stated to Grand Fisher, all captain-level Shinigami, including himself, are actively controlling the size of their Zanpakutō. If they did not do so, they would be swinging around swords the size of skyscrapers.

Kidō Expert: While it is unknown how well-versed he is in the art, Isshin has demonstrated capable skill in binding spells. This is shown in how he enchanted a lucky charm to protect Kon (while in Ichigo's body) with a barrier powerful enough to prevent an incomplete Arrancar with greater power than an average Gillian from attacking him.

Enhanced Endurance: Even without his Shinigami powers, Isshin appears to have the ability to take severe physical punishment (e.g., fighting with Ichigo, getting kicked by Karin, and being in close proximity to Renji's shotgun blast while the 6th Division lieutenant was masquerading as a police officer).

Zanpakutō
The name of Isshin's Zanpakutō has not yet been revealed. It has a red handle and hexagonal hand-guard. It is also hung from a string wrapped around his belt in an iaidō style, and worn with the edge down like a tachi instead of the edge up like a katana. The end of the hilt has a tassel similar to Ichigo's sealed form Zanpakutō.


 * Shikai: Not Yet Revealed


 * Bankai: Not Yet Revealed

Quotes

 * (To Ichigo) "Live well, age well, and go bald well. And die after me. And... if you can, die smiling."


 * (To Grand Fisher) "I'm sorry, Mr. Hollow, but Ichigo's not in right now. As a replacement or something, how about playing with me instead?"


 * (To Kon) "Think about it. I have not once called you Ichigo when you were in his body."


 * (To Grand Fisher) "I'll teach you the basics. All captain class Shinigami are controlling the size of their Zanpakutō. Otherwise, they would all have to swing around a Zanpakutō the size of skyscrapers, just like you. You cannot gauge an opponent's strength by how large his Zanpakutō is."

Trivia

 * His theme song, as chosen by Tite Kubo, is "Don't Drag Me Down" by Social Distortion
 * Isshin was the first character to be shown visibly doing battle with an Arrancar.

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