黒崎 一心 → « ᴋᴜʀᴏsᴀᴋɪ (sʜɪʙᴀ) ɪssʜɪɴ »

High endurance: Since Isshin's children aren't that forgiving (Ichigo often times kicks him out of a window), it just adds to Isshin's stamina and his high tolerance for pain. While it is possible to injure him, one would have to continue to have quite the stamina to do so.

High spiritual pressure: Like his son, Isshin has a high spiritual presence. Shinji and Ichigo could feel it from miles away and he was able to withstand the draining effects of the space between Soul Society and Earth.

Flashsteps: Like most shinigami, Isshin is skilled at flashstep, the ability to move quickly or even in the blink of an eye. He isn't fast like Kuchiki Byakuya or Shihouin Yoruchi because of his body type, but he' s still a lot better at it than Ichigo.

Talismans: While other shinigami use the demon arts to protect themselves (and it's assumable that Isshin knows a few of these spells as well), Isshin's main expertise is the enchantment of amulets and talismans that he gives his children.

Swordsmanship & Combat: Isshin is a master of swordsmanship (due to his training in his previous life as a shinigami), but he's also a master of combat. Day after day, he comes up with new ways to ambush his son: from a telephone pole outside of Ichigo's window, from the windows to the walls etc…

Skilled Doctor: Finally, his human life made him a doctor and he's a damn good one at that too. However, he tends to fail at surgery, hence why he sends those patients to the hospitals, rather than keeping them at the clinic.

ISSHIN AT BLEACH WIKI

Like his son, Isshin keeps his "deeper" emotions buried under a surface of self-confidence. Rather than being sarcastic like Ichigo, Isshin portrays endless optimism and happiness. Though, it also means that he displays his emotions to the EXTREME: EXTREME DADDY HUGS, HITHER TO MY MANLY BREAST, SUPER DADDY KICK TO PREPARE YOU FOR LIFE. It's undeniable that he loves his children with all his heart. He might act perverted or be completely insane in his attempts to get Ichigo, but his children are his life. Without them, he'd be utterly and completely lost, they're all he has.

Isshin is a widower, he lost his wife to the Grand Fisher hollow when Ichigo was 9. To that extent, it explains why he does things to such extremes. He compensates for the lack of a mother, despite the fact that his youngest daughter assumed the maternal role in the family. He loves his children for both parents, he's overbearing because he's being protective for both parents - but most importantly, he feels guilt for both parents. As a former shinigami, Isshin didn't manage to stop the Grand Fisher that took his wife and scarred his child. This guilt always plagues him, despite the fact that he might over exaggerate his woe (he put up a giant mural of his late wife in their kitchen and throws himself against it constantly), he does it to make sure this children don't worry about him. Isshin doesn't want his children to ever see him depressed or mournful, it's not their job to cheer him up. Isshin shows himself to be serious once a year and that's when they go to see Masaki's grave on her death anniversary. Often times, when the kids are asleep, he comes out to her grave and smokes a single cigarette. The same attitude can be seen when he's in battle; most of the time during exposition, Isshin dons the expression of "That's a cool story bro". He doesn't care how awesome you are in battle, your actions speak louder than words (this is also how he parents; grades suck, sex rules!!).

Another example of the switch that Isshin seems to flip from comical to serious is when he avenges his wife's death. The Arrancar prototype keeps asking for Ichigo and Isshin tells him lightheartedly that Ichigo isn't there. Then, as he taunts Isshin and boasts how amazing he is, Isshin stands there and listens him - bored. He doesn't make quite the show, he simply just cuts the other being down without any word. Isshin might act stupid, but he sure as hell isn't. For instance, long before Ichigo starts his training to invade Soul Society, Isshin jumps down from the top of the house to try and land a sneak attack on his son. While on the outside it was because he was being a weird father, it was a ploy to give Ichigo an amulet that he had enchanted to protect Kon in his body. He made a huge fuss, saying that he'd demand it back and that he'd shave his beard if it wasn't returned to him --all so that when Kon was in Ichigo's body, it could be used to save him when Grand Fisher attacked. Though Isshin pretended to be unaware that his son was using a mod soul to inhabit his body, the amulet was never really for Ichigo, but for Kon to protect the body of the son he loves so much.

Then, there's the issue of Isshin hiding his past from his children. Sometime between having children and leaving the Gotei 13, Isshin decided to give up all his powers and live on Earth as a human. He gave up everything because he loved a human woman, even going against the wishes of Soul Society. Whilst Ichigo is on his missions in town, when Kon is in Ichigo's body, Isshin knows that it isn't Ichigo and he makes it a point to tell Kon that whenever he's in Ichigo's body he never used his son's name. Isshin is so protective of his past that he makes it a point to make it seem as if he's the last person to have spiritual pressure. Often, he just credits Masaki for having the gift rather than the fact he himself is a former shinigami.