Okay, this is an idea for a Naruto fanfic. I've noticed that a lot of people go with the whole gig of Naruto being the son of the Yondaime, because of the whole blonde hair, blue eyes thing, oftentimes making up some advanced bloodline belonging to the 4th or Naruto's mother in the process.
But there is another family in cannon with a member with blonde hair and blue eyes. The Yamanaka clan.
Although it is unclear of the skill of the valentine possession technique is related to an advanced bloodline or not, in this fic, it would be, as I've seen in some others, a sort of psychic power bloodline.
A child of the Yamanaka clan was chosen to seal the Kyuubi because the Yamanaka have natural defenses against possession, even untrained they create mindscapes which someone attempting to possess them must navigage, and through meditation, they can change their mindscape and improve their mental defenses, and without training, even if their mindscape is navigated, they have great ability to resist possession and other mental effects, including genjutsu.
In this fic, Naruto is actually Ino's twin brother, only they don't know it of course, since Naruto was disowned soon after the Yondaime died and the 3rd refused to have Naruto killed, which the Yamanaka's had been planning on when they gave up their son.
Part of Naruto's fighting ability when channeling Kyuubi's chakra is from subconciously using his bloodline to pick up fighting instincts from the Kyuubi, rather than being affected by the youki in any way. The mindscape Naruto enters to meet the Kyuubi in cannon only exists in this fic because of Naruto inheriting the Yamanaka bloodline.
Part of the problem of accepting Naruto into their clan is he can't use the art of the valentine or he'd be possessed by the Kyuubi who would then escape, killing Naruto in the process.
The thing that instigates this all being noticed, and the place of divergence from cannon, is the first test of the chuunin exams, when Sakura is possessed by Ino to steal the answers. Inner Sakura rears her giant forehead early, rather than in the prelims, and because she was possessed by Ino, realizes the purpose of the test, she also has realized Naruto can't answer the questions, and demands Ino also possess Naruto and give him the answers as well, just like she is going to do for her own teammates.
Ino agrees, intimidated and freaked out by the agressive split personality Sakura possesses and feeling slightly sorry for Naruto. After giving the answers to her team-mates, she tries to possess Naruto... but instead ends up in his mindscape!
Ino is shocked since only someone really well trained in meditation and intelligent, (such as Shikamaru) or a member of the Yamanaka clan, can create a mindscape, and by the looks of Naruto's sewerified mind realizes Naruto must be related to her and possess the Yamanaka bloodline. Naruto is shocked to be pulled into his mindscape by Ino's presence and freaks out for a bit. Ino explains the situation, and that he seems to possess the Yamanaka psychic bloodline, and helps him answer the test questions. Then Ino notices a 'weird glow' coming from down the hall, and insists they investigate. They both discover the Kyuubi's cage, which terrifies Ino and Naruto is forced to explain about the Kyuubi vessel, and how he discovered this from being told by the traitor Mizuki.
Ino quickly deduces that Naruto must have been disowned, because if he were to be in the clan, it would give them a bad reputation, since he was a demon vessel and he couldn't use art of the valentine, which was the basic skill of the Yamanaka clan which later jutsu's built upon and was the primary method of training for Yamanaka clan members. She has seen how badly treated Naruto is, and is rather independent from her parents and doesn't like them much, and asserts that she thinks this is wrong and acknoledges Naruto as her brother, which makes Naruto really happy.
Ino pulls out of Naruto's mind for the final question, and things continue from there as normal, except Ino explains to her team during the 2nd exam that she'd discovered about the Kyuubi and Naruto being her brother, Shikamaru isn't surprised, saying he'd allready figured it out since they look sort of alike, have the same birthday, which is on the day the Kyuubi was defeated, and the way the adults treat Naruto, and Choji just accepts it. They rush quicker to team 7's rescue against the sound nins, although it doesn't make much of a difference besides Sakura not getting as injured and Ino noticing the seal that was placed on Naruto, who hadn't noticed it himself, when she insists on checking him over for injuries before she leaves.
Because of this, Naruto gets the 5 part seal removed by the 3rd before the preliminaries, and fares a bit better against Kiba. Also, Naruto doesn't cheer Sakura in the prelims, but because she was able to before, Inner Sakura manifests anyway, and surprises Ino by being able to beat her mentally, as Ino thought she'd be able to overpower Inner Sakura.
Things would continue differently for Naruto's training. Ino will have allready convinced her team to have Naruto train with them, and she sneaks into her family scroll stash (which is protected by a special seal so that only members of the yamanaka-clan with their advanced bloodline can open it or read the scrolls) looking for techniques Naruto can use that won't leave him vulnerable to possession.
Asuma gets Kakashi's notes about how terrible Naruto's chakra control is and teaches him the water walking excersize (and notes that Kakashi was either lying through his teeth to get an excuse to train only Sasuke, or Naruto learns incredibly fast in the right circumstances), he also discovers by having Naruto spar with his team that Naruto's taijutsu almost completely lacks form and he has very little sparring experience, and his fighting style is basically street fighting with shadow clones, so he has Naruto train in taijutsu, pointing out that it would make his use of shadow clones more effective.
Ino discovers, much to her shock, that Naruto can't even read properly, not being able to read most things with kanji, and that's one of the main reasons he struggled so badly in the academy, because he was never taught basic things like how to read. Luckily, one of the new techniques she finds on the scrolls allows her to give Naruto some of her knowledge, which she'd sorted and categorized allready for her own purposes, and gives him most of the basic knowledge of Academy ninja teachings, as well as how to read and write properly.
Ino also trains Naruto to use his advanced bloodline. She teaches him the meditations to organize maintain, and clean up his mindscape, which helps Naruto improve his concentration and use more of his inteligence. This indirectly teaches Naruto to call upon the Kyuubi's chakra, by recalling the triggers from the battle against Orochimaru and the battle of the bridge. Ino and Naruto are able to learn some Yamanaka clan techniuqes that are non-cannon, a limited mind reading technique that can work like what people often _think_ the sharingan does, which can operate with simple concentration and no hand seals, but needs you to 'tag' your opponent's mind with spiritual energy by flaring your spiritual aura, a more intrusive mind reading technique requiring hand seals and physical contact which is used instead of interrogating prisoners in some important cases, and an advanced version of the art of the valentine which doesn't need you to leave your own body, but has the disadvantage of not getting your opponent's senses, just being able to control their body, and being forced to split your concentration between controlling your own body and controlling theirs. They also learn telekinetic skills, a jutsu that creates a telekinetic force feild perfect defense (gaseous attacks and particle attacks tend to penetrate it, as can particularly slow attacks, or attacks that are entirely non-physical) although it uses up spiritual energy at a high rate whenever it takes a hit to maintain itself, and basic telekinetic skills of bending spoons and throwing and controlling the movements of small objects such as Kunai or suriken, without touching them. Finally, they learn anti genjutsu techniques that makes them practically immune to genjutsu, because their minds are protected, and some special powerful genjutsu that uses the Yamanaka clan bloodline to it's advantage. They also learn to communicate with one another telepathically over long distances, which only works because they are twins with the Yamanaka bloodline.
Naruto meets Jiraiya because Ino catches him peeping and calls Naruto telepathically to go get him, Naruto nearly gets knocked out by Jiriaya's summoned Frog, but uses the sexy no jutsu to try and trick him like he had against the 3rd or Ebisu, it doesn't work, but Jiraiya is entertained by it, and realizes who Naruto is, and offers to teach him to use his power. Because Naruto learned to enter his mindscape, he's able to learn to use the 'red chakra' in order to summon Gamabunta, in only one day.
Naruto's battle with Neji goes very differently, as Neji discovers Naruto's clones, which now all have better taijutsu skills, are a bit more dangerous, and he reveals his kaiten sooner, and doesn't get to press Naruto's tenketsu, Naruto ends up getting frustrated with Neji and uses his newly found bloodline techniques to force Neji to surrender, shocking much of the crowd.
Naruto's fight with Garra goes much the same, because Naruto discovers Garra's will is too strong for Naruto's jutsu to affect while he's awake, because he's had to resist possession from Shukaku for so long, and when asleep there isn't a point to it.
...
yeah...
So that's my idea so far...