ichigo

I think adding soul society and all the Bleach characters would just overcomplicate things. I think your story is interesting enough without them. I'm a Sakura multishipper too, so I am fine with her being with just about anyone except for Naruto and kinda Sasuke because I've thought for a while that their canon relationship was not very healthy.

Ichigo he’s perfect for her

I'm not a real Bleach fan and would be a bit lost if you involve them, but I would still read it since I'm sure you would explain stuff. I really do like the story, so I'll still read it with whatever you decide. As for love interest, I'd like to think Shisui or Itachi. But I just thought of sweet Choji, or Shino. I kind of like the odd ones at times. Anyways, thank you for the story. I'll be sad when you go on that hiatus, but hopefully you'll get some good ideas.
Ja Ne~

Yes and I would like to see hitsugaya and sakura end up together

It's not a good idea to add the universe of bleach in history I vote for keeping Bleach out of the story. And I would really love to see her with Shikamaru or naruto or If possible three way with lesbian couple): Sakura X Tenten. {if Tenten can have a Zanpakuto}

Sakura x Hitsugaya!

Ah I would really like to see her with Itachi. And I do not know about soul society being connected- I like what you were doing with the swords and having owners like Sakura. But if you do connect this story with soul society I’m sure you will do well. Anyway, I really enjoy this story and I really enjoy your Sakura and how different things would be with Sasuke and Naruto and the team with Minato and Kushina alive and no massacre.

Itachi I think.
Itachi is five years older than Sakura. But Shisui is like eight or nine years older than her. It feels too much like a pedophile. Even when Sakura comes of age, it’s like ...it’s like he is playing or taking advantage of her or something.
I really love Itasaku pairing. And their age difference isn’t that much of a problem I think.

I agree with most of the comments here and say to keep it strictly Naruto. The story is already doing so well on it's own and I think adding Bleach to it would be a bit of an out stretch. Plus if you did add in Bleach to the plot you would have to write about the Soul Society and more which would throw the book off of its course. Though I do think you should have it where Sakura does achieves her Bankai because her relationship gets better with Senbonzakura. As for the pairings I want to say Shisui because he can help her progress as a character and it would be interesting to see.

I think it would be best without the Soul Society because that would mean that any of the characters, that you kill off, could come back and it would also mess up the story if you ask me, but to if you want to add it in then make the Soul Society as a hidden village that no one knows of and keep any killed characters still dead that way you don't have to work too hard in explaining how it's existence in the world your creating for this story. For end pairing, I would say Grimmjow or Ichigo would be good and fun to read how your going to add them in and how the interact with everyone and I can see Naruto nearly losing his head more than once with these two and Sakura not liking them at first, but after sparing with them alot or something else, she finally admits to herself that she likes them but for that to turn to love I would want to see what you think of and if no one has said this yet this is your story, not mine or anyone else's story, and what you do in it is your decision to make and if we like it or not is not your problem and don't let anyone make you think that it is your fault. I hope this helps you and I can't wait to read more.

Hello, sorry English is not my mother tongue, I have a school level so I use google trad for my English reviews (so if it does not have a correct meaning I apologize in advance)
Otherwise I am of the same opinion as the review preceding me (if there was a new one since, it was that of FreeTraderBeowolf)
The way you introduced the "zanpakutos" in this universe detaches it too much from Bleach, the only logical way for me to have Bleach introduced into history would be that the history of bleach is an alternative reality that comes into contact with the shinobi world ... And again it's wobbly so even if I like Bleach, it's not a good idea to add the universe of bleach in history, it will go in directions that will break which has already been implemented.

For the twinning / couple, I will go to Shisui but the age difference bothers me (that's why putting Itachi with Sakura doesn't bother even more, I mean Sakura at 13 at the start of the manga and Itachi at around 17 / 18 years old, if I base myself on European standards, it could be considered as pedophilia because Itachi major and Sakura minor)
And it's the same problem with Shisui because for me he must be as old as Itachi and the rest of the male cast is not famous (shame that Haku is dead, it would have made a nice couple ...)
As I imagine Sakura must be put with a boy, the idea that Sakura have a relationship with a girl is to banish I think, but if not, I think that Sakura and Tenten could work (because the relationship Ino / Sakura remains a rivalry especially after his defeat during the exam, Hinata only has eyes for Naruto, Temari does not appear enough to make a relationship and for me she can only go with Shikamaru, Rin is probably dead at the time of the story and the character was not developed enough to imagine what could have happened if she had survived, Tayuya is too bad girl and especially I imagine not having a relationship with Sakura ...)

For boys, it's the same: Neiji is too haughty and will remain so, no, Kiba is a fool, Naruto, well your story now shows that a relationship between the two would be too toxic for Sakura, Rock Lee is a good guy but too much turned towards his trainings without tail nor head so it could not work long, Shino is ... impossible to identify, Sasuke: NO just no, Gaara you said it yourself so no, the 4 sound ( less tayuya) just no ...

Anyway, for the couple, my three choices would be:

1 - (If possible lesbian couple): Sakura X Tenten (moreover if Tenten can have a Zanpakuto, that would really allow the connection)

2 - (If impossibility lesbian couple and in legality): Sakura X Sai:
I hadn't mentioned it until now but it's still a safe couple for my part, Danzo will surely have heard of Sakura's saber and will want to have all the information on it, so sent a root member in the entourage of Sakura is to be expected, and therefore Sai and Sakura could develop a fairly chaotic relationship at the beginning but which will develop into something viable later.

3 - (If impossible lesbian couple and therefore illegal for my part): Sakura X Shisui.

here, there, sorry for the pavement but I had a lot to say.

Shisui definitely, he's fun loving and will lighten up sakura, though itachi is a close second.
And no to soul society, because you'll be editing a whole lot of things just for things to fit in the story.
While I love hitsugaya and would love to see him, i hope you stick to Naruto vers only.

My vote is yes to soul society
And Ichigo

Just based on what you have written so far, I would have to say that adding in bleach is not an option if you are trying to turn the sword spirit into a Zanpaktou. When we look at the bleach canon, the Zanpaktou spirit is a part of the soul reapers soul, that has developed a seperate identity. In your naruto story, we have a spirit that is in the sword itself and is not an extension of the soul of its wielder. So this sword and the spirit within is not a Zanpaktou. Now if you wish to bring in Bleach, then I can see where some might mistake it for a Zanpaktou and that in turn would open up some plot threads to use. But to do so, you have to show that the elemental nations are in the contemporary time and somehow hidden from the world at large. Not an easy thing to do when you consider how much of the surface of the earth has been mapped via satellite. The other option is to create some portal that draws a portion of the characters from the bleach verse to the elemental nations. This second option to me seems much more feasible than making the elemental nations a part of the modern world.