Noukan Kihara is a character introduced in Shinyaku Toaru Majutsu no Index. He is a member of the Kihara family and is first referred to in 4th Shinyaku Toaru Majutsu no Index novel, as a golden retriever by Kihara Byouri in Baggage City

Apparently Kihara Noukan has been taking 72 requests from Aleister Crowley in in eliminating groups or persons that have grew during his absence and refused to regroup.

Noukan first appears in a pet cafe with Kihara Yuiitsu, with the latter trying to egg him to eat a puppy cake, much to Noukan's chagrin. Having enough of Yuiitsu's teasing, Noukan demands her to get to the point. Yuiitsu tells Noukan that Shokuhou Misaki has noticed the manipulations done by Mitsuari Ayu. Moreover, Yuiitsu tells Noukan that Ayu has begun moving as well, taking over her entire section from within for her use after Misaki noticed. Their conversation later devolves into referring Mitsuari as an "ant" in reference to her name in kanji having of ant in it, and comparing her to the samurai ant. Yuiitsu then laughs as the prospect of Noukan's "work" becoming more violent. Noukan then says that he isn't fond of Yuiitsu's tendency for destruction and says that he dislikes unnecessary destruction, adding that what he is saying is more about his likes and dislikes instead of good and evil. Yuiitsu replies that he doesn't really get him and then pouts. She tells Noukan that what he said means that he is willing to sacrifice millions of people as long as it is necessary, and asks how it is any different from her or any Kihara. Noukan says that it is an issue of likes and dislikes, and scenarios like the one she presented cannot be helped. Noukan says that because of that there will always be a place for horrible individuals like himself.

After the defeat of Mitsuari Ayu, Noukan is out for a walk in School District 15 with Yuiitsu. They later come upon the Celestaquarium for Noukan's 72nd and final request from Aleister Crowley. Yuiitsu says good luck to Noukan, to which the latter says to wait somewhere away from there as he thinks it is going to be rough. He later sneaks in to the building where he confronts a killer whale, a man named as Shundou Toshizou who has transferred his consciousness to a killer whale's brain. Seeing a Kihara before him, Toshizou laments on how Ayu has been captured and thought that she could've been more useful. Noukan asks how many sacrifices it took for him to reach his current brain, to which Toshizou states that it was quite a few, though he settled with a killer whale due to anatomical reasons and personal preferences. Noukan references how Toshizou is the one who tracked down Deadlock and lent them Queen Diver to steal Mental Out from Shokuhou Misaki, though is surprised to find him alive and as a monster after believing him to have died in an explosion. Toshizou notes that Noukan is more of a monster as he based his brain purely on the expansion of dog's brain and had it's lifespan to 80 years. Noukan accuses Toshizou for the one behind Ayu's actions, manipulating her without her even noticing it.

Toshizou mocks Noukan and then summons Molar Tooth, large floating spheres that can block tank shells. With 30 of them, Toshizou brags to Noukan, mocking his canine form. Despite this, Noukan remains silent as Toshizou rants on how now he has to abandon his killer whale body and transfer his brain to a new body. He says that if he kills him then no one in Academy City can catch him. Noukan finally speaks, mocking his attempts and says that he was a little hopeful when he chose his equipment but says it backfired on him. With that, the water tank suddenly shatters. Toshizou however is shocked because the seawater is flowing away from him due to the hole in the outer wall. Toshizou asks Noukan if he fired from the outside of the building, but before he can answer the containers for Noukan's Anti-Art Attachment arrive and destroys her Molar Tooth. The containers then open and all its part come out and surround Noukan while floating. As he lights a cigar to smoke, Tohizou questions how the water flows around him in a perfect circle. Noukan answers it is because he is like Rensa, whose role is to crush the seven Level 5s, and his role is to target being such as Ladylee Tangleroad, Fräulein Kreutune, and Codename Dragon. This confuses Toshizou, but Noukan simply states that he deals with things that are beyond the realm that normal people could comprehend, though says that crushing him is an odd job. With that, Noukan expands this circle and removes all the water that Toshizou is floating on. He then uses the weapons of his Anti-Art Attachment Powered Suit to kill Toshizou.

Already four in the morning, Noukan meets up with Yuiitsu again, who states that she came back because she couldn't help herself. Yuiitsu suggests in getting a quick meal, to which he declines, much to her disappointment. Noukan then sends communication request to the Windowless Building, prompting Yuiitsu to say that he doesn't have to suck to Aleister Crowley. Noukan states that the Kiharas cannot defeat Aleister Crowley, to which Yuiitsu understands that it is because of his Archetype Controller. Here, Noukan notes that with that power he will able to cut the Kiharas off from their surroundings making science into the archetype of being heretical, making the very definition of their existence non-existent. With that he starts talking to Aleister Crowley. Noukan asks if his work has satisfied him, to which Aleister says that it is only the beginning. Noukan asks if Aleister has found something to make up for what had happened to him by fighting the magic gods. Aleister replies that it was necessary even if he had gained nothing, to which Noukan says that he has a habit of sounding rational when he's actually handling everything through emotion. Aleister retorts by paraphrasing Noukan's own words that scientists must be romantics and they must always work to fill people with dreams. With a sigh, Noukan agrees as it is romance that separates men from beasts. Aleister asks if he is wrong, to which Noukan replies that he should ask the Heaven Canceller instead, his attending physician, but says if he has to give an answer as a Kihara, he says that what he is doing will definitely fall on the side of evil, a bland one at that. After Noukan looks wistfully on the starry sky, he is reminded of the world of magic. Noukan says that since he has returned order to his rule as he has tasked him, he requests that he should use the power he has returned to him to destroy all the irregularities known as magic.

(Source: Toaru Majutsu no Index Wiki)

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