Editing Nasuverse (section)

=== Fate/Prototype ===
As the name sort of implies, this was the "rough draft" of what eventually evolved into Fate/Stay Night. Though his more popular female incarnation is the face of the franchise as a whole, King Arthur is still very much a guy in the Prototype timeline, having been summoned in that timeline's second Holy Grail War by a young female mage (who was replaced by Shirou). Many of the characters are either earlier versions of the servants who appear in Fate/Stay Night or fill the same roles as the ones who were made to replace them, but there are some relatively prominent exceptions in both the plot and cast. No ''complete'' version of Prototype has been created, as Nasu doesn't feel particularly interested in revitalizing the original story himself.

Beyond personality differences, the only real changes to the servants involved are Gilgamesh becoming Prototype's Archer and Perseus replacing Medusa as Rider.