Apart the fact that all the Servants summoned for the Grail Wars seem able to understand and speak Japanese fluently as well as understanding the writing systems of the country I was wondering if anyone have listed what languages and writing systems each Servant should know due to their backgrounds.
The Lancers of the fourth and fifth Grail War due to their Irish background can speak and understand Irish in all its various stages through history and write using the writing systems used in Ireland through the history.
Archer (possible future Shirou Emiya) due to being born Japanese never needed to learn Japanese through the summoning since he was a native citizen of the country from the start and knows the writing systems there, and speaks heavily accented English with a Japanese accent and could possibly know how to read and write English (which uses the Latin alphabet).
Assassin(s) and True Assassin from the fourth and fifth Grail Wars speak Arabic and Farsi (Persian) and has a high probability to know old Frankish and Latin and can write in the Arabic and Persian alphabet.
I have trouble figuring out what Servants like Saber can read and write as well as Archer (Gilgamesh), even though some of the Servants like Fourth Grail War Caster (Gilles de Rais) are easier to figure out or imagining what languages they can speak and write.
The Lancers of the fourth and fifth Grail War due to their Irish background can speak and understand Irish in all its various stages through history and write using the writing systems used in Ireland through the history.
Archer (possible future Shirou Emiya) due to being born Japanese never needed to learn Japanese through the summoning since he was a native citizen of the country from the start and knows the writing systems there, and speaks heavily accented English with a Japanese accent and could possibly know how to read and write English (which uses the Latin alphabet).
Assassin(s) and True Assassin from the fourth and fifth Grail Wars speak Arabic and Farsi (Persian) and has a high probability to know old Frankish and Latin and can write in the Arabic and Persian alphabet.
I have trouble figuring out what Servants like Saber can read and write as well as Archer (Gilgamesh), even though some of the Servants like Fourth Grail War Caster (Gilles de Rais) are easier to figure out or imagining what languages they can speak and write.