This OC is by Asuna_Ayase I hope you like it.
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Genre: This is for a fan fiction. I already started the book so if you want to you can check it out. I've only wrote like one or two chapters though so not much progress has been made so far.

Got ya, thank you for the information, I will make sure to check it out. Trust me I always read about the OCs I review.

Name: Kazumi

Cute.

Age: the first half of the first chapter she's ten but from the second half of the first chapter and on she is twelve. (She comes in in Naruto Shippuden so she is two years younger than them.)

Oh ok, so she is around Konohamaru's age like maybe a year or two ahead of him? That's cool and different, I have seen a year younger and boruto age but I don't think I have seen one around Konohamaru's age.

Gender: Female

Nice

Family: Hidan (father), Kirigiri Kosaka (Mother, deceased)

Oh shoot, now that is new, I have yet to review a OC that is Hidan's daughter. Nice. Also thanks for the role and the life status.

Appearance:

Oh she is very pretty, I'm guessing she looks like her mom sense she doesn't look like hidan.

Personality: Swears a LOT, sarcastic, mischievous, friendly to certain people but not many. (Like Tobi, Deidara, Kisame, Hidan, and Konan.) She gets annoyed easily. She has a good sense of humor and all her jokes are really funny. (Like the one she did in the first chapter of my book.)

Ok, not to mention you can tell she is Hidan's daughter from the swearing. Actually a lot of these point to Hidan so what can I say besides like father like daughter.

Battle: she likes to use the scythe Hidan gave her for her birthday, she is really good at Taijutsu and pretty good with ninjutsu, not good at genjutsu or medic jutsu at all. Her main element is Water and her secondary is Wind. She knows the jutsus.

Nice and it shows her resemblance to Hidan. This is good as well because her fighting style goes with her personality and points to her father.

jutsus: Water dragon, Water Prison, clone jutsu, transformation jutsu, Wind storm (its kind of like what happens when Temari blows her fan but just not as powerful) and other ones but I forget what they're called. Sorry. They're not very powerful though just about high genin to middle chuunin level.

That's fine in fact it's very good. She has the well known jutsus and isn't over powered. The fact that the jutsus aren't even above high chunin also shows room for her to improve if you want her to in like a time skip or something. It also points that she is good at taijutsu and Kenjutsu.

Past: Kazumi is the daughter of Hidan and Kirigiri. Kazumi's mother died after she gave birth to Kazumi. Kazumi grew up in the akatsuki. When she was five her mother's brother attacked them because he thought that Hidan had killed his sister. Before Hidan could do anything Kazumi's uncle stabbed her in the heart. Hidan then got really mad, killed his brother-in-law, and checked to see if his daughter was ok. He realized that she was still alive and well like nothing happened. That was when Hidan figured out that she was immortal like him.

I was going to ask how did she survive before remembering that she could be immortal like her father. Not to mention this is a pretty good past and it shows more traits that she got from Hidan.

Pein has been sending her on missions since she was nine. Every time an akatsuki team would go with her. She became used to killing and it was actually very easy for her. Hidan taught her how to use a scythe, and the other members taught her ninjutsu and taijutsu. When she was twelve, Pein sent her on a mission to gather information on Naruto, the nine-tailed fox. And the story starts about around when she gets that mission.

This is pretty good but when did she start actual training and learning how to kill? Seeing as she is Hidan's daughter I can see her learning how to kill or be comfortable with it but I don't understand when she could start killing full grown ninjas. I'm sure it's in your story or will be put in so I'll be patient and if you don't want to tell it here, than you can private message me.

Relationships: none yet. I haven't really decided on who for her to like.

Ok, that's fine. It's no need to rush anyway.

Other: Just like her father, she believes in Jashin. She likes to kill for him and so she believes that it is fine for her to kill just about anyone for the sake of her religion. Also, the reason she swears a lot is because she lives with the akatsuki and everyone knows how much Hidan swears. Well, I think that's it! I hope you don't think that my OC is completely terrible!

No in fact this is one of the best OCs I have seen that is related to a canon character. She's not OP, she's like her family, she's not trash trust me. Also thanks for the information above, it shows that she is truly like her father.
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Final Analysis- This OC is very good and has a lot of great qualities. To be honest this OC really has little to nothing wrong with it. The only thing I would suggest is confirming the age where she started training because if she started training at 6 than there would be no way for her to learn how to kill in 3 years. Other than that this OC is really good. Thank you so much for letting me review your OC. It was a honor.
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