as used in the first season
The anime uses a number of different alphabets, but I think only one of them is “real” – the one appearing on maps, some shop signs, and royal decrees. There seems to be only one case used, and no numbers have appeared so far.
The other “alphabets” are;
- Some kind of petroglyphs:
- Some kind of cursive scripts that look nothing alike:
- A blocky script (or two) in the weapons’ shop signs and on the bottles at the apothecary, could be related to the petroglyphs but the example are too fuzzy to tell:
- A script of vertical strokes that vaguely resembles Ogham, usually mixed with the “real” alphabet and another blocky alphabet that may or may not be the same as in the shop signs. Note that the “pseudo-Ogham” strokes are either all above or all below the line, but it can switch on the same page:
As for the real alphabet, I was able to decipher the following:
it’s hard to make out, but a lot of small text appears to be “abcdef…” 
misspelled Motoyasu 
Melromarc place names are terribly unimaginative apparently
also mapmakers write random names upside down
