Genjutsu comes in many forms. The basic genjutsu with the aim to deceive being a sensor will help you as you will be able to note your chakra. Like Karin
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That is the only form of genjutsu that being a sensor will help you out.
Genjutsu with the intention to deceive.
Any kanashibari genjutsu wich aims to paralyse however being a sensor is pointless because those illusions are clear for all to see, the aim isn't to deceive, but rather to paralyse and create an opening. Once's you have been paralysed, sensing helps you not.
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Tsukuyomi also falls into this. Sensor or not, you fall prey to this.
Next is the ability to manipulate another form of genjutsu, which has overcome sensors as they have absolutely no control over themselves and their actions. We have seen both Fu and zetsu sensors controlled.
The first is that the sharingan was able to keep up with EI's v1 raiton no yoroi and Bee in his first stage jinchrucki form. This allowed Sasuke to evade both of them. If the sharingan can keep track of these shinobi's, dojutsu based illusions will work on them. Its only in v2 raiton no yoroi it elude the sharingan.
But ask yourself how many shinobi's have the equal or greater foot speed as v2 Ei. The only Shinobi's are current obito and Naruto. Foot speed wise, the likes of Minato, Bee, Tobirama are at best roughly equal if not inferior to V1 EI.
Bee claimed nobody but his brother has managed to deflect his number 8 and this is hype being given to his speed in this form, yet the sharingan could read it and allow sasuke to overcome it. [
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In this same form with this same speed, we know for a fact that the sharingan managed to keep up and allow sasuke to evade it. But at the same time with this same speed and form sasuke managed to catch Bee in an illusion [
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We also know for a fact that sharingan based illusion requires no handseal
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Its execution is more or less instant and Itachi managed to catch Bee
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Genjutsu offers many variations, the one's used in battle mostly are kanashibari based illusions and the generic illusion which aims to deceive the opponent.
The generic genjutsu is actually a counter to speed or any form of movement and we have seen this. When Itachi's clone met Naruto an illusion on naruto. However we know for a fact that once an illusion has been executed any form of movement that the victim experiences is all a deception, with the victim in real life not moving an inch.
Itachi's genjutsu was executed on this page. The middle of the page where Itachi raises his hand and points, note that at the top of the page the team kakashi were all standing together.
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We see naruto charge with a ransengan [
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It is then confirmed here that, the illusion was executed when itahci pointed his finger [
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Simply Meaning everything after that was an illusion including naruto charging in wit the ranengan. We know that for a fact naruto has never moved from his initial point which was besides Chiyo and Sakura and that is where he still was when they broke him free from the illusion. [
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That is one form of how genjutsu is actually a counter to speed or any form of movement, through deception where any movement experienced are illusions and in reality you are standing at the exact same spot.
The other form being a kanashibari based illusion, where you completely paralyze your opponent and restrict movement. We have the sound based form in mugen onsa an gamarinsho. Visual based form with Magen Kasegui or other visual based, examples are sasuke paralysis Shee and Madara paralyzing EI.
Which brings me to another topic concerning what madara did to EI. Many claim he had to hold EI down in order to execute the illusion as EI is too fast. That is one way of translating it. The other way is that sharingan based illusion are short range. There he had close the gap and bring EI within range to order to invoke the illusion and if infact you look closely it appears madara is leaning forward to further come within range [
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]. While i do get the argument that he needed to restrict EI as in v2 his speed is creates a form of visual based counter, i believe what madara did was to get him within range of the illusion more than anything.
Anyway the whole speed is a counter to genjutsu hardly holds when we bring in sound based illusion. Even when we restrict this argument to visual based, not many people have the same speed as v2 raiton EI. Also no shinobi is constantly moving, its usually v1 raiton no yorai for EI and minato never constantly teleports nonstop.
Finally genjutsu offers two distinct ways of overcoming any form of movement. Either through deception where any form of movement experienced is an illusion and in reality the opponent is stationary or the ability to paralyze your opponent and strip them of any form of movement
Minato's shunshin at best is equal to v1 EI.
Tobirama's shunshin pales before Minato's, meaning at best Tobirama's shunshin is probably equal to base EI's shunshin without raiton armour. That speed is troubling Itachi
Its true clones are a counter for genjutsu, but it isn't fool proof.
We already know what side effects of clones so im not going to explain that. Kakashi used clones, however he used them in injunction with naruto's help[
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]. In a 1 vs 1 fight, splitting your chakra just to counter a portion of a shinobi's arsenal isn't a great strategy though Tobirama by hype and feats has a fair bit of reserve.
Finally there is a misconception which goes along the lines of "Genjutsu doesn't affect clones". That is false as we have seen Genjutsu affect Kakashi clone. However the reason its a counter is that, it doesn;t affect the original, that is why clones are not only a counter to genjutsu but any form of attack as it doesn't directly affect the original.
However one massive thing people forget with the clones strategy is that it was used by kakashi. A shinobi who after naruto has the best bunshin usage ever. He used it in a unique way to outsmart itachi
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Kakashi concealed himself with a doton and used a kage bunshin to act like the real self, while the original hide in the hole. Anyway shinobi who creates a kage bunshin in front of itachi, wouldn't fool him because its no shit, you have created a bunshin. You would have to come up with something of kakashi's calibre to outsmart and bait him out to use tsukuyomi or some sort on a bunshin otherwise if you just create a bunshin in front of him, he is no fool to recklessly use tsukuyomi.
Finally this itachi will fall for the same trick twice is a farce. Itachi has been shown to one of the most intelligent characters in the series and id like to think the same trick doesn;t work on him twice. He managed to disperse naruto's clone and recognise and mention genjutsu with the original.
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Tobirama can beat Itachi but right now im leaning towards Itachi
Erm am i allowed to pick none?
Just countering your genjutsu refute and nothing else as ninjutsu will overcome tobirama