Musashibou Benkei (Fate) Wiki

Lancer-class Servant developed for Fate/Apocrypha and properly appearing in Fate/Grand Order. Ushiwakamaru (Minamoto no Yoshitsune)'s retainer, and a warrior monk who is famous for his loyalty and strength.

However, this "Benkei" is not actually the true Benkei himself, but merely an ordinary soldier under Benkei's command who were so impressed with his master's chivalry that, after he survived the downfall of both Yoshitsune and Benkei, he lived the rest of his life of that of Benkei's and spread his tale. Resulting into him being enshrined as the folk hero "Benkei" in the Throne of Heroes.

Character Design: Terada Katsuya
Illustrator: Shinjirou
Voice Actor: Inada Tetsu