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Chakra also connects emotions, mind and soul. This is a very big thing in Naruto as the very foundation of chakra is to use it as a linking force that can interact with and connect others spiritual and mentally. Giving them the ability to understand and communicate with each other with out the need of words.You're not really considering how fundamentally different the systems involved here are. Sirius’s Authority doesn’t just hit the mind or soul directly the way a basic soul or genjutsu attack would. Her ability links her emotions, senses, and soul to other people using the Od, which is a unique metaphysical construct in Re:Zero.
further more the fact that will-power and emotional amps are emphasized in the verse is proof how how connected emotions, soul and the mind are in the verse.
Chakra is in a similar position as normal folks can’t manipulate chakra and is completely insensible to the normal folks. Even before the time of shinobi, chakra was not even known to the people to have existed, only when hagoromo came around did he teach people of the existence of chakra. Shinobi themselves can’t sense chakra only a select few can do that, which either have special doujutsu or are sensory type ninja with a six sense for chakra detection.The Od isn’t something like chakra that characters train, manipulate, or sense. It’s not a network of energy lines or a pool of power. It’s a non-physical, invisible bridge between body and soul that also governs things like mana flow and spiritual health. You can’t sense it with observation skills or scan for it with energy perception. It’s something you’re born with, and most characters never even become aware of its existence unless it’s damaged or disrupted.
Chakra too is non-physical in nature and can only be materialized by having high concentration of it in one place and even then is takes the form of flesh like the tailed beasts
The metaphysical part seems iffy but okThat matters a lot here, because Sirius’s hax doesn’t require her to target you directly. Just being aware of her — not even seeing or hearing her, just knowing she exists — is enough to trigger the link. Once it’s active, she can amplify your emotions to the point of death, control your thoughts and actions by overriding your emotional state, transfer pain or injuries to you, and even cause your death if someone else nearby dies. These aren’t conventional attacks. There’s no hand seal, no spiritual burst, no visual effect to react to. She doesn’t need to aim it or activate it — it's passive, automatic, and based on metaphysical proximity.
Then this is a total mis-matchNow compare that to Itachi. Yeah, he has impressive resistance to chakra-based hax. He can counter genjutsu, resist mind control, and even exert influence over his own Edo Tensei form. But all of that is still happening within the logic of the Naruto verse. His resistances work against chakra-based interference — illusions, spiritual effects, or soul-level jutsu — but they don’t scale to something like the Od, which functions on entirely different metaphysical principles. Itachi has never dealt with a system where the soul and emotions are forcibly linked to someone else's without a jutsu or clear technique involved. He’s never shown the ability to perceive or even recognize something like the Od, and without that, how would he even begin to resist or defend against it?
This is exactly why cross-verse assumptions break down. Saying “he resists soul and mind hax” doesn’t mean he resists every kind of soul or mind hax in fiction. It means he resists the types that exist in his own verse. Sirius’s Authority works on a completely different axis — it bypasses conscious defense entirely and attacks a part of a person that Naruto characters aren’t even built to deal with. Unless you can show that Itachi’s resistances explicitly extend to metaphysical structures like the Od, and that he has any kind of defense against soul-emotional resonance that doesn’t rely on chakra, there's no solid reason to think he would be unaffected.
At best, it's speculative. At worst, it's a total mismatch of mechanics. So no, saying “he resists soul and mind manipulation” isn’t enough here. Not when the nature of the manipulation, the triggering conditions, and the metaphysical structure it interacts with are completely foreign to what Itachi has ever encountered.