Teenage Jinchuriki Shinobi is a crossover fanfic between Naruto and Teenage Mutant Ninja Turtles 2003. Originally starting off as a retelling the former with Splinter and his four turtles involved, such as with them raising Naruto and training him in the arts of ninjutsu in addition to him being under the Konoha Ninja Academy. It eventually branches off to its own story.
TMNT: Continuation fic, taking place after the event of the Back to the Sewer season.
Naruto: Alternate History. While the events of the former was mostly completed, the events here start off with a younger Naruto who hasn't even started his training at the academy, Sasuke being kinder and having a younger cousin that survived the Uchiha massacre, and Hinata's love being noticed and repayed.
Mizuki used Naruto to try to obtain the forbidden scroll as a ploy to sell it off.
Like he does in canon, Kabuto acts as a bumbling fool participating in the chunin exams when he's actually Orochimaru's right hand man.
Subverted with Itachi
Character Development: Sakura starts off as an annoying fangirl of Sasuke, but stops lusting over him (As Himeko puts it) and actually starts too see how it was annoying him. Additionally, she went from a Faux Action Girl to a legitimate one.
Cheerful Child: Himeko was one until Itachi killed most of the Uchihas.
Chekhov's Gun: The story that Yin Yang tells Himeko about Kureno and Kyoko about their child. See Foreshadowing below for more details.
Continuity Nod: It seems to takes place after the end of TMNT 2003, but replaces the events of Turtles Forever. This is noted when Splinter says Shredder was defeated, and with married couple Casey and April. It starts off with Naruto only being a child.
Dirty Old Man: Jiraya wondered what Himeko, a thirteen year old looked liked NUDE
The Dragon: Kabuto to Orochimaru, Sakyo to Kira, and Karai to Shredder.
Dumbass Has a Point: When Tsunade assigns a mission to team seven and the turtles regarding cold weather, Mikey is quick to point out that since they're reptiles, they can't go out or they die. Donny is Crazy-Prepared though.
Humiliation Conga: After the purple dragons are defeated by team seven, and he foolishly tries to charge at them despite being severely outnumbered, Hun gets called an idiot, gets two kicks from Naruto and Sasuke, punched in the face by Sakura, gets his shirt torn by Kin's thrown daggers, and another set of kicks by Raph and Himeko.
Implacable Man: Zabuza was far tougher to hurt, flat-out ignoring Leo's kick which would otherwise hurt.
Konoha Loves Turtles: In-Universe Example. Unlike back in New York, where the turtles grew up, everyone was fond of them in Konoha. Of course, everyone did freak out the first time they saw them.
Kin and Kushina at the beach scene, with many hitting on the latter.
Muscles Are Meaningful: Zigzagged. Zabuza is ripped, yet not much larger than the ordinary man, and swings around a BFS effortlessly. Silver Sentry plays this trope more straight, being a superhero expy of Superman.
Everyone being terrified the first time that they see the turtles. Zabuza even calls them freaks!note clearly in a condescending and insulting manner rather than a terrifying one but still...
When Leo and Gaara meet, Leo states that they weren't wearing odd costumes, though hard to believe, and Gaara responds with them saying that they've seen the extraordinary before, and then said the turtles were indeed extraordinary, alluding to what Shredder said when he met them.
Shredder's Badass Boast, followed by Sasuke saying that he has a big ego.
Took a Level in Kindness: One of the first things Kin does upon her accepted Heel-Face Turn apologizes to Sakura when she decides to live among Konoha, after hearing that Orochimaru basically didn't care about her. Sasuke is also on better terms with Naruto and Sakura here, and Sakura eventually stops fanboying over Sasuke while also being on better terms.
Trash Talk: Neji was a more passive example than most.
What Could Have Been: An inuniverse example. When Sarutobi died, Konoha was in need of a new hokage. Who does Mikey suggest? Splinter. What was Jiraya's answer? He talked to the ninja council about it, but it was turned down.
Would Hurt a Child: Even though said children can fight back, many of the older villains from both universes have no problem trying to hurt them.
Naruto is seen being chased by an angry mob, just because he has the kyuubi inside him.