Was thinking about an 'alternate universe' where a young Sasuke, in the absence of guidance on how to carry out his clan traditions, tries to connect to his fractured identity by spending time in the Naka Shrine and accidentally summons the ghost/spirit of Izuna who hears his cries of injustice and grief from the other side.
Truthfully, I don't know why it would be Izuna in particular, but I'm kind of playing around with the idea that his death was viewed as so unjustifiable and horrific by Madara that Madara's devastation over it prevented Izuna's spirit from properly/completely passing over into the Pure Lands. So, Izuna's spirit remains in this unaware-but-restless state and one day it materializes to answer the call of another Uchiha (who also just so happens to be an Indra transmigrant, like Madara, if we want to go there... maybe their emotions carry extra weight and power within the spiritual world) now trying to process his own unimaginable grief, this time over the death of his entire family, bloodline, and culture. Thus they become bound to one another (for better or worse) and Izuna is, from then on, always there, carried by (and only visible to) Sasuke on his journey...
Maybe they both come to believe that if they get justice for the clan (which they initially believe is by killing Itachi, 'the kinslayer') then Izuna will finally be freed and Sasuke will have done right by his family and avenged them. But really, I think what would actually be keeping Izuna 'stuck' is the plan that evolved (at least partially) from Madara's grief over his death, Project Tsukuyomi... thus their quest expands and the two then need to figure out how to alleviate Madara's guilt/sense of loss over Izuna's death and rekindle his feelings of hope in the world once more (ie. stopping the plan). Somehow, lol.
And I think Izuna would be a fun character to do with this with because there's so little we truly know about him, but so much we can infer due to his impact on other characters' actions/story events.
Idk, in my opinion there's just a lot of opportunity here for a good mix of heart and comedy, especially with Izuna as a more defined character that has a little more freedom than other characters to be molded. I also think having someone Sasuke can connect to, that's from his clan (but is also still deceased and a reminder of how alone he is, ie. end of the day Izuna is still a ghost, an ancestral relic of the now-dying clan) would have a profound effect on him.
It'd almost be like his own inner Kurama voice except Izuna provides no chakra or power amps, only scathing commentary on how much he hates the injustices of the village (and its Senju leadership) lol. Also, I like to think his reactions to all the in-universe stories about 'Madara's deeds' (which is really Obito) would be entertaining.
A sketchy comic since I like the idea so much haha:
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snowghoul
romaincrisis
izzy806
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theartofmadeline
