History Fanfic / KaiensFateAizensExperimentAndIchigosSister

* EnemyMine: Gin is someone Kirika hates almost as much as she hates Aizen, with him being on her list of people she wants to kill painfully alongside side Aizen and Tosen. That said, she knows full well how much she ''needs'' Gin's intel and aid if she has any hope of killing Aizen, and is fully aware that Gin's hatred for Aizen rivals her own, to the point he deliberately spared Kirika all those years ago as a form of long-term investment towards revenge on Aizen. So Kirika and Gin are perfectly willing to work with eachother in secret, if only until they can both achieve their revenge.

** Kirika herself notes that Ichigo tends to be dense when it comes to things like noticing Orihime's feelings for him.

* EnemyMine: Ichimaru is someone Kirika hates almost as much as she hates Aizen, with him being on her list of people she wants to kill painfully alongside side Aizen and Tosen. That said, she knows full well how much she ''needs'' Ichimaru's intel and aid if she has any hope of killing Aizen, and is fully aware that Ichimaru's hatred for Aizen rivals her own, to the point he deliberately spared Kirika all those years ago as a form of long-term investment towards revenge on Aizen. So Kirika and Ichimaru are perfectly willing to work with each other in secret, if only until they can both achieve their revenge.

* AlmightyJanitor: Lampshaded when the group learns that the Co-3rd seat of the 4th Division is doing janitorial duties.

** Quincies like Uryu are naturally far more adept at using their spiritual senses that even the best Soul Reaper trackers because, since they primarily use external Reishi in contrast to Soul Reapers using their own internal reserves, they ''need'' to be able to sense abnormalities in the Reishi surrounding them, and get much more practice with it besides.

** He never learned any healing Kido above a mid-level one, and that only because of thoroughness, because he never thought that anyone would actually be able to ''hurt'' him save Yamamoto (at which time he'd have [[HealingFactor unlimited regeneration]](, so he's unable to fully heal the wound Kirika gave him.

* Ban and Ho underestimate how much power Kirika can use in her gigai, which is part of why Yuzu survives their attack.

* BigSisterInstinct: After her adoptive mother's death, Kirika became potentially even more protective of her siblings, Ichigo included, than Ichigo is to Yuzu and Karin in canon. She actually threatens to ''kill'' Urahara if his schemes cause any permanent harm to Ichigo, and the rest of the Shoten crew thinks she might actually be able to follow through on it.

* CoverBlowingSuperpower: Kirika's Zanpaktou could be recognized as Kaien's if she used it, so she can't use its Shikai when rescuing Rukia without blowing her cover to Aizen. Not that she has much trouble regardless.

** Wabisuke's Shikai is useless against the Shikai of Sentaro's Senkomaru, since it's power is LightEmUp (its blade being lightsaber-like HardLight). After all, photons have no mass, and no mass means no weight, so Wabisuke's ability to double the weight of whatever it hits is useless. Zero doubled is still Zero, after all.

** Shinigami are forbidden from doing the Power Transference Rite. However, a Shinigami is defined as one who either has graduated from the Shinigami Academy, or as someone with Shinigami powers who has been entrusted with a Substitute Soul Reaper's Badege. Kirika, while she has all of the standard Shinigami abilities, does not meet any of those definitions, thereby meaning it is not technically illegal for her to use the Power Transference Rite to [[spoiler:save Tatsuki before she dies from Reiryoku buildup.]]

* SuicideByCop: Nejibana confirms in the latest chapter that Rukia was able to kill Kaien because he managed to retain ''just'' enough control over his body, and enough affection for her, that he was able to ''let'' her strike the fatal blow.

* RationalFic: Is it really any surprise, given the author?

* RequiredSecondaryPowers: Quincies like Uryu are naturally far more adept at using their spiritual senses that even the best Soul Reaper trackers because, since they primarily use external Reishi in contrast to Soul Reapers using their own internal reserves, they ''need'' to be able to sense abnormalities in the Reishi surrounding them, and get much more practice with it besides.

* SurprisinglyRealisticOutcome:
** Kirika has some major SurvivorsGuilt regarding her friends from Aizen's experiments. Part of why Urahara gets the Kurosakis to adopt her is to help her recover and keep her from going off and doing something stupid. She herself notes that it's amazing that she has no nightmares of that time.
** Urahara's habit of keeping secrets bites him in the butt with Kirika, who is tired of being LockedOutOfTheLoop for a lot of his plans (in part because part of him still worries that she's part of a plot by Aizen) and not being allowed to tell Ichigo and company what she ''does'. She outright threatens to mostly cut ties with him after Rukia is rescued, and tells him that she'll kill him if he hurts Ichigo with his experiments (something the other Shoten members think that she might actually pull off). Even his friendship with Yourichi starts to fray.
** Aizen, while a skilled Chessmaster, can't account for everything, especially an OutsideContextProblem. Kirika's involvement throws him for a loop because he thinks she's dead and doesn't have any solid info on her Kokken Asa persona.
*** He also focused on the higher ranked Soul Reapers (3rd Seat and above) when hypnotizing people, assuming that no one below those ranks could pose a serious threat (presumably, he also had pragmatic reasons for not just being able to hypnotize everyone), so Yumichika's true power level surprises him.
*** He also is not immune to being caught off guard and injured. Kirika hitting him with a fire kido right as he shows up, having expected him, actually does some damage, for example.
** Although Dalk is all but completely immune to fire, she ''isn't'' immune to the air pressure burst from an explosion. It's the main reason Yoshino devised an explosive fireball technique.

* HardLight: Senataro's Shikai blade is made of this, which renders the weight-doubling Wabisuke useless against it.

''[[https://www.fanfiction.net/s/10973625/1/Kaien-s-Fate-Aizen-s-Experiment-and-Ichigo-s-Sister Kaien's Fate, Aizen's Experiment and Ichigo's Sister]]'' is a ''Manga/{{Bleach}}'' fanfic by [=SeerKing=] where Aizen used Kaien's reiatsu in a number of experiments, and the only survivor managed to escape to Karakura Town and be adopted by the Kurosaki family.

Shiba Kaien died at the hand of Kuchiki Rukia after being possessed by a Hollow. This is well known. What if Aizen drew Metastacia from Hueco Mundo and extracted some reiatsu belonging to Kaien for another experiment? This is the tale of the result of that experiment; Kurosaki Kirika.

* NotSoDifferent: When thinking about how Aizen will probably wait for everyone to be too wounded or tired from the battles before making his move, Kirika notes that it's what ''she'' would do in the same situation. She's more than a little disturbed at how easily she can get inside Aizen's decision-making processes.

** One of the things that Kirika points out about Aizen's "murder" to Toshiro is that ''no one noticed it while it was happening''. Considering how powerful Captains are, it should be nearly impossible, if not entirely so, to keep anyone from noticing the Riatsu or sound of such a clash, especially since his ''own'' sword "killed" him. So how come no one knew about it until they found the "body", ''well'' after when he supposedly died? There's also the fact that the Ryoka simply lack the ''ability'' to have dome it given their current power levels.

* SurpisinglyRealisticOutcome:

* RealityEnsues:
** Kirika has some major SurvivorsGuilt regarding her friends from Aizen's experiments. Part of why Urahara gets the Kurosakis to adopt her is to help her recover and keep her from going off and doing something stupid. She herself notes that it's amazing that she has no nightmares of that time.
** Urahara's habit of keeping secrets bites him in the butt with Kirika, who is tired of being LockedOutOfTheLoop for a lot of his plans (in part because part of him still worries that she's part of a plot by Aizen) and not being allowed to tell Ichigo and company what she ''does'. She outright threatens to mostly cut ties with him after Rukia is rescued, and tells him that she'll kill him if he hurts Ichigo with his experiments (something the other Shoten members think that she might actually pull off). Even his friendship with Yourichi starts to fray.
** Aizen, while a skilled Chessmaster, can't account for everything, especially an OutsideContextProblem. Kirika's involvement throws him for a loop because he thinks she's dead and doesn't have any solid info on her Kokken Asa persona.
*** He also focused on the higher ranked Soul Reapers (3rd Seat and above) when hypnotizing people, assuming that no one below those ranks could pose a serious threat (presumably, he also had pragmatic reasons for not just being able to hypnotize everyone), so Yumichika's true power level surprises him.
*** He also is not immune to being caught off guard and injured. Kirika hitting him with a fire kido right as he shows up, having expected him, actually does some damage, for example.

* BadassGay:
** Yoruichi and Soi-Fong.
** Kirika is also hinted to be attracted to women, namely Tatsuki.

[[https://www.fanfiction.net/s/10973625/1/Kaien-s-Fate-Aizen-s-Experiment-and-Ichigo-s-Sister Kaien's Fate, Aizen's Experiment and Ichigo's Sister]] is a Manga/{{Bleach}} fanfic by [=SeerKing=] where Aizen used Kaien's reiatsu in a number of experiments, and the only survivor managed to escape to Karakura Town and be adopted by the Kurosaki family.

* BoxingLessonsForSuperman: Kirika plans to give Ichigo these when they return to the World of the Living.

** Kirika has been using Hakuda against the Onmitsukidō, almost exclusively, if not entirely so (like her teacher Yuroichi), so the lack of any signs of it having been used on the body of the member Gin killed with a slashed throat to hide their meeting, despite her beating a group of them that way not far from the scene, tips the Captains off to the involvement of a third party in play when combined with the above.

** Yuroichi and Soi-Fong.

** Yuroichi's focus on Hakuda is revealed to be partly because she can't carry her sword in werecat form (not to mention it not being exactly an assassin's tool), and a preference towards fighting with only Hakuda with the Onmitsukidō. It certainly helped that she usually didn't use it when she was still with Soul Society unless she was punishing someone.

** Yuroichi took a ''century'' to ask Soi-Fong out... right before Aizen's FrameUp.

** Gin kills an Onmitsukidō member to cover up his and Kirika's talk. But the ''way'' he did it, slashing his throat, tips the Captains off to someone else working behind the scenes, since Kirika/Kokken Asa, like her mentor Yuroichi, has previously used only Hakuda against them, and it would be weird for her to change methods so suddenly, especially after defeating a group of them that way fairly close to that location.

** Yuroichi took a ''century'' to ask Soi-Fong out... right before Aizen's FrameUp.