Character Concept Direction for Hisana
Hisana has been a somewhat tricky character to pin down, so far, but given the latest insights we've had in the thread, I think that a fairly self-consistent concept for future growth is taking shape, which I'd like to expand on.
Consistently, we've voted for Hisana to reconstruct and repurpose not just jutsu, but fundamental constants of other people's combat styles. Most obviously, she copied the idea of Tsunade's seal wholesale to deal with her stamina issues, and she went to great lengths to reconstruct Shisui's technique, to great success.
It runs deeper than just those examples, though. She took a great deal of inspiration from that first Chunin Exam she witnessed a while back, when it comes to her use of chakra strings and receptor seals to modify her ranged attacks. She "stole" Sakura's place on Team 7, but copied large amounts of medical training from her to partially make up for it. And she fully plans on using her access to the Raven Summons to copy shippuden Naruto's success with Sage Mode.
Even in hiring tutors to teach her techniques like Iaido's anti-handseal focus, or asking Asuma to teach her Wind Infusion, you can see a strain of this sort of piecemeal practicality. Heck, even the chakra she keeps in her seal is sourced from Naruto, much of the time, and you can make an argument that as an avid member of the Naruto fandom, even her idea to train fuinjutsu is unoriginal, since she undoubtedly sourced some of her ideas on how dealing is underused from the wider fanbase.
In short, she's something like the natural evolution of Kakashi - instead of just copying a jutsu and adding it to her arsenal, she builds her whole combat style around extremely powerful singular techniques that she can synergize together. Her theme is probably best expressed as "abusing the greatest strengths of others".
And this is all something you can build off of as a character design spectacularly. It's a natural extension of her mentor's reputation as the Copy-Ninja, for one, and plays into her position as inheriting the Uchiha's famed eyes without the sense of clan pride to inhibit her behaviours. Shameless cheating ninja, through and through.
Stealing Yoroi's technique and building around it ties into this on multiple levels. On the first, Hisana once again found an underused jutsu and explored it ruthlessly, stealing it from her opponents. On a deeper level, working in the direction of chakra drain lets her literally use her opponents strengths against them.
Because of the way that external chakra manipulation techniques naturally scale to the level of ones opposition, they're a natural fit for Hisana's role in the story and her desire to be able to alter canon - letting her affect relevant change on very high level combat while not needing to reach that level as desperately herself. Thus, in addition to being thematic, it's also a practical consideration for the circumstances she's in.
It will of course take a lot of effort before she can even do something as relatively simple as work on Yoroi's jutsu until she can channel it through a sword instead of requiring palm contact, but it's a path for her development that I'm very much sold on. And in the long run...? Chakra dispersing "Anti-Magic Fields" area seals fall into her "chakra manipulation" fuinjutsu theme, as would more directly applied chakra draining or inhibiting seals.
Imagine just cutting off the connection Nagato has to his Paths, or that Kabuto had to the Edo Tensai. Or encountering a hostile Sage Mode user (we aren't the only transmigrant, and it's one of the classic "paths to power" in Naruto) and being able to disable their balance of physical, mental, and natural energy with an applied seal. Insta-statue.
My only real complaint is that she doesn't have the Magpie summons yet, but since they're Corvids, even that is on theme.
