Fate/Prototype is a reimagined version of Kinoko Nasu's original version of Fate/stay night. The storyline takes place eight years after the tragic Heaven's Feel. Here, the Holy Grail is still the so desired object. However, the darkness under this so-called "Grail" is revealed while the characters proceed to fight against each other in order to win.
| Actor | Role |
|---|---|
 Kana HanazawaAyaka Sajyou (voice) | Ayaka Sajyou (voice) |
 Takahiro SakuraiSaber (voice) | Saber (voice) |
 Yuichi NakamuraArcher (voice) | Archer (voice) |
 Kazuya NakaiLancer (voice) | Lancer (voice) |
 Chiwa SaitoMisaya Reiroukan (voice) | Misaya Reiroukan (voice) |
 Aki ToyosakiManaka Sajou (voice) | Manaka Sajou (voice) |
 Mamoru MiyanoRider (voice) | Rider (voice) |
 Megumi OgataRider's Master (voice) | Rider's Master (voice) |
 Hiroki TouchiFather Sajyou (voice) | Father Sajyou (voice) |
 Takehito KoyasuPhahn Sancraid (voice) | Phahn Sancraid (voice) |