kishimoto might have been a mostly bad writer but he kinda went off with Breaking The Cycle as an overarching theme of the whole series

A/B/O dynamics. with a twist.  — i’m done seeing omegas as the ones rare in a/b/o. how about alphas. Konoha is full of omegas and betas, as the current norm. Alphas are quite rare, depending on the clan. Omegas lead the village more than the other two secondary genders, using 60% of the population. The rest, 35% of the village are betas, with the staggering number of 5% for the alphas, from any clan.  Alphas have unnatural strength, making the elders prone to keep them in the village, and stop them from fleeing. Some are respected, and some are feared, the members of the village hesitant in being with an alpha, in case they get controlled by the alpha voice. Mikoto made sure to remind her youngest to always, always keep his scent blocker on at all times, and made it their mission to hide his gender. Sasuke presented as the second alpha of their generation. That isn’t the reason why she wants him to hide it, aside from the backlash he’s going to receive. She doesn’t, and will not, allow her child be another weapon, a tool to the village. She knows it, seen it, the way people regard Uchihas as aggressive, emotionless, and unsympathetic people.  She knows, he’s gonna be used, controlled. They would use him against the clan...And they would get crushed to the ground with accusations of Sasuke controlling others. She wants to protect him from the rest of the world, to let him be his happy, loud self without being judged by the stereotypes.  Sasuke is a bright child, with grins as wide as the sun, blinding. He has the darkest eyes, like the night sky. With fair skin as light as the moon. He’s lean, without the usual bulk his father has on his shoulders and legs, leaning into his mother’s features with big doe eyes and lanky limbs. Splitting image, with his father’s attitude and mother’s looks. He was told to be an omega like his nii-san, looking so similar.  His mother made it a mission, making sure to teach him manners. He grew, being polite and civil in important gatherings, how to talk smoothly with respect. To bow with grace and smile with acknowledgement, to praise and to appreciate. He knew the responsibilities he too, carry as the son of the clan head, even if he was the second. He knew, and learnt. Became to be his mother’s gentle child to his father’s kind child, Itachi. Their Uchiha temper is still there, but he managed to control, to dull it under a facade, a mask. His eager and curiosity hidden behind his quiet, patient eyes, even if all he wants to do is ask without thinking about the consequences. Shisui would always look at him with a genuine smile, “I know you’ll bring peace.” His cousin would say, the only other alpha besides his father in the clan. Shisui would encourage and teach him, becoming his other older brother, than Itachi’s ‘maybe next times’. He smiled emptily once, looking more like a grimace. His Mangekyou ability reflected on his secondary gender. ‘I can cast a powerful mind-controlling genjutsu on victims so that they obey me without realizing. I can change their thoughts and future decisi—‘ Shisui stills, before gagging, leaning to the side, horror filling his face, blood red tears flowing down. ‘I won’t ever use it. Never.’ He said it with so much conviction and honesty, that it brought Sasuke to tears. Shisui is the most caring, affectionate, good-natured, understanding man ever, and even if he didn’t say that, Sasuke knows deep in his heart, his soul, that he still would never use that. Shisui and Itachi would always steer him away whenever Danzo is near, Shisui even opting to body flicker just to hide him. ‘Danzo would take Sasuke if he could. You’re already being watched, Shi.’ Itachi murmured one time, his rose and honey scent turning metallic and strong. Shisui’s pheromones tip over like a wave, the salt of the seabreeze and pine cones. He learnt not to trust the council man, and the suspicious bandages covering his arm.  Pack. ‘It is something you care for. You protect it with all of your heart.’ Mikoto Uchiha once said. ‘They’re the ones that will be with you for life. You protect. You do not control. You protect.’ she says, when he was missing Itachi. He learnt he had a strong, high alpha instincts, on how protective he can be. ‘You can hide it, but you can never keep it away. ‘  Sasuke knew independence. He became one with it when he was alone. When all of his loved ones disappeared in one day. They went alongside his voice, and emotions, leaving him blank as a slate, his burnt cedar and mint scent dull and bland. Silence. He became quiet, unnaturally so, his past shell of smiles and grins disappearing. His pack was killed, by his own brother, and he wasn’t even there. He wasn’t there. He failed. He failed to protect his pack. Protect. He allowed the hatred, the vengeance, the loss, grief, pull him to the darkness. He let it settle deep in his heart, weighing down on his shoulders. All he wanted was to scream, and scream. He wants to know. Why.  He tries, tries so badly to hate his brother. Uchihas love deeply, fiercely. In a way that is like no other. Deep to the bone and staining the soul. He tries to find the will to hate his brother, and force it to intensify, but it doesn’t work. He loves. He protects. He can’t hate his brother, even if he tried. He tried, he promised, he tried until he cried tears, until his Sharingan whirled widely in front of him. Until his scent spiked and his chakra thrashed, until he passed out.  A silver-haired man kneels over him, shaking him. Worried lone, black eye stares at him, mask covering his face. The scent of dogs, puppies? cover the man, with the ashy charcoal undertones. He stares back blearily, exhaustion marring his bones, making them heavy as lead. His Sharingan involuntarily activates, chakra pathways protesting as he scrambles back, panicking about his scent uncovered. The jounin coos, before his scent intensifies, covering him. Alpha. Sasuke frowns, dazed, aching, unmoving on Kakashi’s arm.  One thought crossed Sasuke’s mind when he sees the eye underneath the hitai-ate. Not traitor. Kin. Pack. Family.  Kakashi takes one look, before hugging the boy close, he will not lose another Uchiha in his life. They both lost their packs? They’ll be their own pack. Without others judging them.  Kakashi adopts Sasuke. It might’ve been an impulse decision, or maybe he’s poisoned. He didn’t know why, but he wants. For once, he wants. He wants to keep a kid from being alone. Wants the boy to have someone when he needed it. Wants the boy to not burden his clan’s death. Wants the boy to be protected from the village elder’s greedy hands. To keep, the boy from being a weapon. So he doesn’t turn to be like Kakashi.  Gai laughs, relief flooding him to see Kakashi dropping off Sasuke on the Academy, with a lazy half-salute and eye-smile before body flickering away. The Uchiha scowls, before pocketing his hands, and strolling lazily to the doors. Same dry humor, posture and antics. Sasuke has lightning affinity, similar to Kakashi, to his amusement. Lee hops brightly beside him, before the kid runs to Sasuke, declaring becoming ‘eternal rivals’. Sasuke’s jaw dropped, and wide, panicked eyes is too amusing for the people around them, the stoic Uchiha for once a loss of words, and startled.  ‘A shinobi looks underneath the underneath.’ Kakashi-nii— sensei tells them, lone dark eye calculating as he looks to the three genin in front of him. Underneath the underneath. Just what are you hiding, nii-san?  Sasuke groans, hand moving to rub at the sore muscles of his arms, the prickling wounds around his chest and arms burning. Sakura is gentle in healing the pierced skin, nerve endings on fire from the onslaught of senbon. He breathes a sigh of relief when he touches the scent blocker still secure on his gland, wearing the high collar shirt back on after the bandages. He winces at the fabric grazing the sensitive skin, before his nose wrinkles at the overwhelming scent of citrus and brown sugar attacking his nostrils. Loud, worried voice shouting ‘Teme.’ echoes through the clearing, making him raise his hand in assurance. Sakura’s faint cherry blossom scent wafts to his sensitive nose, her chakra muted as she lay on the ground motionless, Naruto’s prone from by the tree fraying his senses. Adrenaline courses through his body as he stands on wobbly legs, tongue bitten enough to draw blood. His gland itches at the blocker tight on his neck, as he moves his limbs to carry Sakura. He lets his strength appear, as he hops down silently to the ground, finding a cave to lay Sakura securely. He hisses through his teeth as he buckles to the ground, pain lancing his shoulder. He moves, willing himself not to stall as he crawls to Naruto, carrying him over his back. He sits cross-legged by the entrance, weaving a genjustu over them as he stays up for watch.  ‘You have a curse seal, and extremely chakra exhausted.’ Shikamaru observes as they break the genjustu, Ino scurrying over to Sakura. ‘What’re you doing risking your life like that?’ he hisses in worry, the Uchiha pale as a sheet, limbs shaking. ‘What happened?’ he asks, as he holds Sasuke’s face in place, forcing him to look directly on his eyes. ‘Orochimaru. Messed Naruto’s seal. Bit me. Had to protect. Pack. Been 5 hours since. On guard in case.’ Sasuke croaks weakly, before passing out. Sasuke tries to awkwardly become closer to Naruto and Sakura, even if he’s hesitant in touching. Sakura rolls her eyes before hugging him on the front, Naruto jumping on his back to circle around his shoulders, with Kakashi’s hand ruffling his hair. He will protect his pack. He will not leave them.  He became a chunin, and an ANBU with Kakashi as his captain. Moved through the ranks quickly, eventually turning to a jounin in couple months’ time. Naruto and Sakura became apprentices of the sannins, having them as mentors, which they tease him about. He huffs, before smirking smugly, ‘Who’s the jounin here exactly?’ which gains him disappointed pouts, a beta and omega ignoring him. They offer him more physical touches, Sakura linking their arms, or Naruto letting Sasuke have an arm around his shoulders. ‘Touch-starved bastard’. Kakashi making sure that he has control on where Sasuke is going to, knowing that his genius/prodigy status will lead him to dangerous situations. Added to the alpha secondary gender? no. He and Shisui already suffered, alongside Itachi on the village’s bad decisions. He will not let Sasuke become a bad decision nor a mistake. They will prove themselves worthy. Tsunade giving him a mission to go undercover for 3 years, striking a deal with Orochimaru. He does it without questions, knowing that Orochimaru needs to be killed, and he would gladly do so. He goes through day by day, sitting through experiments with the intent to kill Orochimaru at the end. Desperation clawed at Orochimaru, having a test subject that is an Uchiha, one of the last ones to exist, an alpha nonetheless.  Sasuke made a promise, to never use alpha voice, unless necessary. He doesn’t see the need to use it, since it only ruins Izuna’s name, being a descendant. He doesn’t want to taint their line, doesn’t want to be seen as his great grandfather, Madara. A rare thing, deep growling as his eyes turn cobalt blue, that makes his instincts go haywire and his movements shaky. A ability that he resents, because he never wants to see gold-eyed omegas and emerald eyes reflecting back to him.  So he doesn’t use it against betas or omegas. He uses it against alphas who dare hurt them, using his alpha voice to push alphas back from his pack. Aggressive and relentless, when alphas try to control his pack, dusty burning cedar reeking his hunched form, chakra venomous and crackling, burning like a thousand embers, his Uchiha blood reflecting his rage. Sasuke can be seen sitting down beside Shisui after he uses his alpha voice, hint of alpha pheromones still oozing from his form. (Sasuke and Shikamaru. Please. Sasuke knowing that Shikamaru is fully capable and independent. That doesn’t stop him from pampering or spoiling him. He keeps his protective nature from interfering but they both know that Shikamaru likes it even if he doesn’t wanna admit it.) Iruka adopted Naruto. 

What would Itachi be like on Curse-of-Hatred mode?

The curse of hatred is bullshit invented by Konoha to discriminate the Uchiha. 

(antiKonoha, antikishimoto under the cut. Also anti-martyr/submissive Itachi and heavily and fiercely pro-Sasuke)

It’s a shitty double standard according to which Uchiha people love so much that their love turns to hatred, thus making them crazy, and this is called curse of hatred, as if other characters from other clans were immune from feeling hatred and wanting revenge. So much that not only Shikamaru’s revenge is fully supported by the village (even though he was quite out of it after Asuma died, isolated and all, and he only got better once he killed those who killed Asuma), but even Nagato, a villain who wanted everyone to feel his pain because Konoha and its allies had killed his family, isn’t considered as victim of something like a curse of hatred, just because he isn’t Uchiha.

I don’t acknowledge a plot device whose purpose is to force Sasuke into a villain-ish position, when his actions were caused by desperation and anger for the loss of his most precious person, his family and clan, his dreams and future, since as he himself said, his dreams are in the past only, and his very identity, since he only saw himself as an avenger, no longer a person who can have a life and bonds, because he’s just a tool for revenge. When he ALWAYS sought justice, whether it was for his parents/clan against Itachi, or for Itachi/his family and clan against Konoha, and ultimately, for all the past, present and future oppressed by a faulty system that he intended to change so that no one would be oppressed anymore.

I don’t acknowledge anything that puts Sasuke into a faulty position, compared to Konoha and its representatives or supporters (take Gaara who used to kill people for fun), but also compared to Itachi or anyone else, so I don’t support a good Uchiha (Itachi, Shisui) vs bad Uchiha (Sasuke, Madara) distinction, because they’re all different people with different lives, in a different context, despite parallels and obvious similarities.

Itachi’s situation and Sasuke’s are different. Itachi was manipulated and blackmailed, and he suffered immensely, but he knew the truth about everything and he made his own choice. Sasuke didn’t know the truth and he never had a single choice but to react to what life threw at him, which means Konoha’s oppression and his brother’s decisions. So I don’t care about kishi’s retcon in order to make N*ruto appear the good guy because he forgave Nagato for Jiraiya, and Obito for his parents, it doesn’t make Sasuke less innocent, in fact it only makes him more human and real. 

Besides, I don’t see Itachi as a pro-Konoha martyr, as it’s pretty clear that he acted out of love for Sasuke first, and that he threatened Danzo to spill Konoha’s secrets if he harmed Sasuke. Such scenario would unleash him, or the so-called curse of hatred.

To reply to your ask, Itachi showed a glimpse of what he’d do if Sasuke died or was badly harmed. In the Itachi Shinden books he uses Amaterasu on the guy who poisoned Shisui, a slow painful death, during which he told him coolly that it was for Shisui. If this isn’t enough, as books aren’t exactly canon, he threatened Danzo after the massacre and he returned to the village after Hiruzen’s death, to remind him of that threat. When Orochimaru came out of Sasuke’s curse mark in order to take him over, even though he was weakened and dying, he became scary and took him down. Another detail not included in the manga but fitting for him is that his hand is shown supporting Sasuke’s final chidori against N*ruto, meaning that he supports Sasuke in all his choices, which kinda parallels his last words of love and total support. All this makes me think that he would be a scary enemy, a powerful one, a genius who’d be so many steps ahead of his opponents that there would be no way of contrasting him. He’d read his opponents, and he knows them all already -he knows everything after all- and he’d find their weaknesses in no time, and he’d use them to manipulate and weaken them. He would be really scary and he would win.