Talk:Cú Chulainn (Prototype)/@comment-38.82.201.187-20170801194628/@comment-1351914-20170812025646

(Prototype) means they are from Fate/Prototype which, as the name suggests, was the first prototype of Fate/Stay Night.

Basically it means it's a "What if we had gone trough with our first ideas and didn't refine them?". It's more or less the same as the normal fate, but a lot of characters have different traits. For example, Shirou is a girl, Saber is a man, and other changes.