This fic in particular needs a lot more attention; it takes a concept that's mildly popular in the Japanese fandom but mostly remains in fanart, and executes in a completley different yet brilliant and fascinating way. Shirou is, as mentioned, incredibly different in an understandable way— yet still the same. The author definitely knows what they're doing, and put a lot of thought into the story and the Servants in this alternate take of the events of the Fifth Grail War. Not to mention, besides the aforementioned Tsundere Rin bonus, it contains a truly epic Crowning Moment Of Funny
in which Shirou trolls Gilgamesh. With video game spoilers
. It needs to be seen to be believed. For that matter, Shirou's altered dynamics with many of the characters, Gilgamesh included, are just as fascinating and interesting and fun to read.