that's 100% Samson from the bible long hair super strong old era clothes, fitting to have a female beautiful master and the thing that sold me on it is the chin cuffs on his arms that connected him to the pillars in the story
I mean, the grail can summon anyone from every nationality (and time period even) regardless of where the HGW is taking place, I am just surprised the writers chose Jalter of everyone to be in this, tho it probably was really because of her popularity.