I didn’t think I was going to be able to decipher the alphabet in Overlord because there was very little on-screen text whose meaning could be guessed. That is, until episode 6 of season 3 showed the sign of the establishment known to be called “Singing Apple”:
Most of the on-screen text was clearly English, so the rest of the alphabet was easily deciphered from the Adventurer’s Guild notice board:
Only some background text appears to be gibberish:
Scrolls appear to be recycled text:
The rest of the characters were identified from the legends on a few maps:
All the text in every magic circles seems to be “firewall”.
There is some text that appears to be in other alphabets, such as on the coins:
and in Eight Fingers’ ransom letter:
There’s no clear frame of the Eight Fingers’ logo, but from what is visible it seems the text on it is all gibberish:
The season IV opening has some text that is mostly romanized Japanese names, unfortunately partially obscured, but surprisingly offers the first clear and unambiguous example of “X”:
