

If Shirou Emiay were to obtain a Zanpakuto, what do you think its Sealed form, Shikai, Bankai, and Zanpakuto Spirit would be like?
I mean, Shirou is all about swords, and Zanpakuto are some of the most famous swords in anime/manga.
I know some may prefer asking if he could Trace a Zanpakuto and what would happen then, but I want to think of something more personal.
How he obtains this Zanpakuto.....ummm.....uh........don't worry about it.
Coming up with a Shikai/Bankai for Shirou is hard because, well,
- Zanpakutos and their Shikai and Bankai are already Personality Powers, and you could argue Unlimited Blade Works and Shirou's Tracing/Projection are already powers that fit his personality. So coming up with a NEW Power based on Shirou's power may be hard.
- When he can basically copy almost any sword/weapon he comes across, how do you come up with something unique for a sword that represents SHIROU himself/specifically?
I did have SOME crazy ideas, but not exactly for a Shikai/Bankai
First off, there is this tidbit
>According to Q&A #277 by Tite Kubo on his fansite "Klub Outside", all Zanpakutō consist of two separate parts, the blade and the scabbard; Sayafushi and Zangetsu are the only two Zanpakutō without a scabbard
So, I imagine that Shirou's Zanpakuto's Scabbard would take some design cues from Avalon. Just in appearance, mind you. I mean, considering that it is a Sheathe/Scabbard that is so important to Shirou as kind of the origin of his...well, Origin of Sword, I feel like it manifesting as part of his Zanpakuto would be fitting.
My other idea was sort of a way for UBW to mix with the Zanpakuto, not really as a Shikai or Bankai. I had the idea where it is just the handle and scabbard, usually with no metal blade, but the scabbard is actually connected to Shirou's UBW, and he summons the blade from the scabbard, plugs it into the handle, and then quickdraws it. Whenever he re-sheathes the sword, he can switch out the blade for one with a new power from another blade within UBW. It's like the usual logic of Iai: you keep it sheathed so the opponent can't guess the length of the blade, but this time, it's about the sword's power.
I hope this logic makes sense, but I am not too sure about this one because, again, how would it relate to Shikai and Bankai?
One part of mastering a Zanpakuto is to communicate with the Zanpakuto Spirit within one's inner world tied to their soul. Well, Shirou already has one of those: his Reality Marble Unlimited Blade Works.
As for his Zanpakutyo spirit, I imagined it being a Saberface, considering how Avalon is an artifact tied to Artoria/Saber and Avalon kind of influenced his soul a lot due to the whole Sword Element/Origin that it did. And an idea I had was that, if UBW is referred to as a "steel manufacturing factory", then if Shirou is the owner of the Factory, then this Zanpaktou spirit would be the Manager of the Factory.
None of these ideas pertain to the Sealed form, Shikai, or Bankai; they are just random stuff I was coming up with.
So, what are some ideas that you guys have imagined for a Zanpakuto for Shirou?
And please do not just give him his canonical abilities, but translated into Bleach powers. I want actual new stuff.