1. Itachi's description of his multiple failures in both convincing his clan (which was a good cause) and manipulate his brothers' mind (which was a downright wrong cause) are much more honest than most people in this forum are about him. The amount of things Itachi did to Sasuke under the arrogant assumption that he could see how his brother would finally grow up are almost psychopatic. Only when he openly admits he failed and his attempts to manipulate Sasuke were wrongdoings Sasuke finally started reconsidering his ways and searching a new path for himself. Itachi is pretty objective in judging his life and the evil he committed, only here on Narutobase he is hailed as a hero with no personal flaws.
Mary Sues can often have flaws. The main qualifier of a Mary Sue is that he/she is almost entirely immune to consequence. Which is why being called a Mary Sue is often a negative connotation. It's indicative of sloppy and indulgent writing that is generally boring for the reader.
Itachi "left Sasuke to Naruto" - only for Itachi, in the end, to be the impetus for series of events that led to Sasuke deciding to be a 'good guy' (or, at least, to not want to destroy everything). It's ultimately Itachi who 'saves Sasuke.'
His plan/methods may have been a bit more circuitous than he originally envisioned - but it all came down to Itachi. Arguably - Itachi saved the day, as he not only sealed Orochimaru in a way that allowed Sasuke to recover him - but also prompted Sasuke to resurrect Orochimaru to go about talking to the past Hokage... so they could come and save the alliance from a massive tailed beast bomb.
Now - I'm sure you'll try and argue that it's a bit of a stretch of logic - but do remember that Orochimaru worked for Root as well as Itachi. It would not be surprising to find out that the two had a sort of standing agreement - even a plan.
You seem to be confusing "no flaws" with "amazing competence and strenght". While I am willing to admit that Itachi is too much competent and strong and some weakness would've made him a better character, he still is a flawed being as any human is. He has deficiencies, and pretty big ones.
"No flaws" is not the definition of a Mary Sue. Unless you're talking about Highschool Musical or Twilight.
I'll go ahead and quote the origins of the term:
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"The term "Mary Sue" comes from the name of a character created by Paula Smith in 1973 for her parody story "A Trekkie's Tale"[2]:15 published in her fanzine Menagerie #2.[3] The story starred Lieutenant Mary Sue ("the youngest Lieutenant in the fleet — only fifteen and a half years old"), and satirized unrealistic Star Trek fan fiction.[4] Such characters were generally original female adolescents who had romantic liaisons with established canonical adult characters, or in some cases were the younger relatives or protégées of those characters. By 1976 Menagerie's editors stated that they disliked such characters, saying:
Mary Sue stories—the adventures of the youngest and smartest ever person to graduate from the academy and ever get a commission at such a tender age. Usually characterized by unprecedented skill in everything from art to zoology, including karate and arm-wrestling. This character can also be found burrowing her way into the good graces/heart/mind of one of the Big Three [Kirk, Spock, and McCoy], if not all three at once. She saves the day by her wit and ability, and, if we are lucky, has the good grace to die at the end, being grieved by the entire ship."
Mary Sue is generally regarded as negative because she removes the consequence and conflict from a story - to the point where her death is actually welcomed by the audience because it means other characters get to do something rather than constantly being saved by Mary Sue.
2. That's why I said Naruto is pretty dumb for things unrelated to combat. This part of your argument is therefore void.
Naruto is brilliant in his use of tactical ploys. Much like a fox. He comes at you from angles you are unprepared for, and in ways you least expect - completely ignoring 'standard procedure' since he's pretty much skipped all those classes.
Jutsu learning and creation is a completely different monster, all together. Naruto figured out that he could use a shadow-clone to insert wind chakra. Minato - a genius working on the problem for years alongside and also a known practitioner of the Shadow-Clone jutsu... did not even think of it.
Naruto learned and even began to master wind-release, a technique that takes most Jonin years of practice, in a time frame of less than a month.
These are well outside the realms of what "raw determinaton" can be expected to achieve. He has very poor chakra control, even now - yet he mastered a new form of release and controlling that within a Rasengan within a month?
It's the defacto learning pattern for Naruto. "It took so-and-so years to learn to do that!" "I'll try really hard and stay up really late, and get it in a few days!"
[two weeks later]
"Man, that took longer than I thought. It was really challenging."
Naruto's learning process in a nutshell. There's never a task he simply can't solve through brute trial-and-error; or something he is working on throughout the story. The Fox doesn't count for this - because Naruto doesn't actually set out to 'bond' with the Fox until a hundred chapters ago, or so. And even that just kind of magically happened.
3. Hinata could actually faint if you tell her Naruto was behind her. She grew out of that now, but she didn't make a brilliant show of herself for most of her screentime.
Okay. When Naruto was cheering for her, she fought Neji head-on and refused to be defeated. From a character standpoint - she never was defeated by Neji (though she did lose the match).
4. You seem to consider yourself the only keepholder of the true meaning of the "Mary Sue" label, just as you consider yourself to be the only keepholder of the true meaning of the Naruto series. You're not.
*shrug*
When it comes to analysis, you'll find few who are better at it than me.
If I cannot tell you what is - I can tell you what may be. If it is possible to tell you what is - then it is people of my caliber that do so.
"Mary Sue" is a term that has been in constant use for years before now. The common traits of a Mary Sue, while they tend to vary, are usually intended to be:
a) Mary Sue never fails
b) Mary Sue's personality is above every criticism
c) Mary Sue's talents are above everyone else's for no apparent reason
d) Mary Sue's flaws are all minor, or even invoke sympathy (eg Mary Sue is a terrible cook)
e) Mary Sue's intervention always solves major problems in the plot
f) Mary Sue is constantly praised by the author and the other characters
Whatever you say, I partecipated to dozens of discussions about which character is a Mary Sue and which one isn't in fictions, and when people say "Mary Sue" they usually mean one character with the above written feats.
I couldn't care less about how the ignorant masses use a term. The term is used to describe a character who is anything from "annoying" to far more constrained definitions about how much a character resembles the author. Allowing emergent definitions to be treated as relevant when they draw little inspiration from the source of the term makes the term meaningless.
Words have a definition. When you start changing the definition of words - you start creating a different language. A dysfunctional proposition, particularly when it is not immediately obvious that the english words being used are not, in fact, a part of the English language.
The only character in Naruto who actually fits this description is Minato. Hinata doesn't fit even one of these requirements, and Itachi and Naruto both fill only e) and f).
Minato fits the Mary Sue title - I agree.
Not sure why 'we are arguing' over Hinata's status. I clearly argue against her being a Mary Sue.
Naruto is an expected Mary Sue. He's the Goku of the series. "But he has flaws to his personality" doesn't work. Despite these flaws - the character is seen being loved by all who surround him/her. The personality flaw is an endearing trait.
Itachi is practically a mirror instance of the origin of the phrase, except Itachi doesn't attempt to work his way into the hearts of everyone. So he's a 'Dark Mary Sue' who comes along and fixes everything even though few people really like him (except Hiashi).
Itachi would be Kakashi if he weren't a Mary Sue. Even then - Kakashi carries a considerable amount of plot-armor and plot-no-jutsu.
Which, there is a difference between plot-armor/plot-no-jutsu/etc and being a Mary-Sue... but it's more difficult to make that determination when the subject author (kishimoto) so routinely protects his characters.