[@Shoryu Magami]

I had one more thought on languages. Perhaps they can be useful if you plan on include language based puzzles at some point of the story, or if one of us (the assassin, maybe) decides to leave a"business card" in a certain language. Unless the writing /reading barrier is going to fall as well as the spoken one.

On my end, I would have a character with four known languages ask of which she's fluent in, being two birth languages, one from the place she went to graduate and French, which is the international language of diplomacy and science.