Fridge / Fate Ingens Cor

• Many Servants' identity are English - Saber is Lancelot, Archer is Robin Hood, Caster is the Green Knight - because this Grail War is unfolding in England and their Masters didn't use relics to call a Heroic Spirit, so the system gave them a Servant fitted to their surroundings.
• Hermione's appreciation for Archer's handsomeness: canonically, she winds up married to Ron. Her liking her redheaded Servant's looks is a Mythology Gag.