Author's Insights:
Just fyi, this version of Shirou doesn't exactly look like Shirou from the Heaven's Feel Epilogue (despite what the Shirou LILY story picture might lead you to believe lol). That's what he'd look like in a few years naturally (lol), but at the moment, he just looks like Emiya Shirou during the events of the 5th Holy Grail War, only wearing a completely white shirt.
That's it, that's literally it.
Lily (white) indeed.
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A version of Shirou that never suffered from the Fuyuki Fire, and was never influenced by Kiritsugu's foolish yet beautiful ideals.
I actually came up with the idea of "Shirou Lily" when Saber Lily was first announced, and I tried to imagine what a "Shirou Lily" would be like.
I mean, in some senses, Emiya Shirou himself is already like an "EMIYA Lily", so what would an even more "Lily" version even be like? Ultimately, I came to the conclusion that the only way Shirou could be even more "Lily" than he already, is if he isn't traumatized by the Fuyuki Fire or influenced by Emiya Kiritsugu in the first place, since those are the things that really start off his road into the darkness (i.e. going down Archer's path).
It's essentially my idea and take on what a Shirou Lily (a more pure, more innocent version of Shirou) would be like. I imagined a Shirou that still wanted to be a hero, but one that was uncorrupted and unscarred by the Fuyuki Fire, and without the burden of Emiya Kiritsugu's burdens weighing on him.
Just like Artoria Lily is as a knight-princess unburdened by the weight of her country and the expectations of her people, Shirou Lily is a hero-protagonist that is unburdened by his own survivor's guilt and the weight of Kiritsugu's twisted ideals.
In terms of his heroism, he's more a traditional hero than Emiya Shirou is.
Rather than trying to save everyone (out of guilt), he's more of a tradition that tries to save "everyone he can", which doesn't sound like a big difference, but is actually a very important distinction, and a much more realistic goal.
And though he's willing to risk his life for others, he doesn't approach dangerous situation recklessly, but with a plan. And he doesn't take a self-sacrificial attitude in doing so (because he has no guilt that compels him to do so).
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Just fyi, his last name, in "The Holy Shirou War" conceptualization at least, is "Senji", referencing Muramasa and the possibility of being Muramasa's somewhat distant descendent, by a few hundred years or so.
Actually came up with idea long before Muramasa came out as a Pseudo-Servant, but originally was just going to call him something like Kennoyama (剣野山 lit. Sword Field Mountain) Shirou, but I guess that relates more to Emiya Shirou and EMIYA, huh?
Well, then again, given that Muramasa is also themed around forging blades and mountains, I guess this could still work as a last name for his descendent, if the last name changed over time, for whatever reason. Just imagine Shirou going up and spelling out his name in his introduction for all his Japanese classmates, though. They'd all be like "woah, that's such a cool last name!" And Shirou would be like, "Yeah. Thanks. I know."
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(OMAKE)
Incidentally, Shirou Lily's most powerful (hidden) personal skill (besides Harem Protagonist EX) is also a skill that also doubles as his Noble Phantasm.
It's a skill that verges on the border of being a true magic, touching upon the boundaries of the second and fifth magic.
Taiga Dojo EX
(Type: Anti-Reality, Anti-Spacetime, Anti-Self)
Nobody knows what this ability does.
Whispers from the very edges of the far reaches of the outer realm of reality (imaginary number space) say that it has something to do with automatically denying reality upon death and being able to redo a crucial decision point in your life, reshaping your fate into a more favorable one. Supposedly, an unlimited use ability.
Those same whispers also say something about receiving advice from a certain shinai wielding tiger ("DON'T CALL ME TIGER!") and a certain spunky bloomer wearing magic girl, though those sayings are unverifiable and considered to be complete nonsense by the Professional Scholarly Association of Trans-Dimensional Magicians (a counsel whose sum total of members consist of two magicians, the illustrious and widely beloved Lord Zelritch and his fellow magician, Aoko Aozuki).
Some whispers even seem to say that the spunky bloomer girl comes in 40 different costume varieties (unverified). The Ultimate One of the Moon fervently denies this, for some reason. When asked for a comment, they had this to say: "No, no, that concept was scrapped in development. (*laughs*)"
(END OMAKE)
