[X] Serenity, Assassin
Regardless of how well one might write one of the samefaced Saber and properly ride the tiger that is established media/reader expectations thereof, or how interesting the new frills n' quirks on this or that Saber may be (can't deny loving me some Nero pomp, for example), that's still just a reskin of something I've seen way too many times. I'd even go past that to say it's something we all have seen, if not too much then certainly enough. And really, there's only so good your umpteenth helping of ice cream can be when you have it nearly all the time - a bit of cake or pie or fruit tart is necessary as a contrast. And on that note, how many of those other characters have we read in fanworks - how many of them have we even read outright, with the assorted barriers of language/accessibility? Seems to me that it'd be better to let the QM stretch their legs with less tightly defined characters, let a character with few-to-no fan roles get some screen time, all that.
A pity I found this so late, as I'd have soapboxed hard for Frankenstein; the munchkin and whatifist in me is too enthralled by the notion of throwing Medea, competent Magus Shirou and Frankenstein into a mixer to ferment.
Some fun stuff'd come out of the mix, of that I'm certain... ah well, another time(as if Shirou/Caster combos are common in any iteration, save one that might end up with Frankenstein involved).