Talk:Adventurer/@comment-29043528-20160714210000/@comment-75.117.166.28-20170131064400

It never specifies whether or not demihumans can become adventurers. It makes it fairly obvious (without outright saying it) that elves and half-elves can become adventurers, but other demihumans are not specified. When talking to the guild master Ainzack tells Ainz that elves are considered the same status by most guild halls, and that while views are mixed most adventurers disagree with their mistreatment and slavery. It also states that their countries are protected by adventurer guilds as well. So it's safe to assume that the only reason you don't see them (or read about them in this case) would be that their population in the three main kingdoms are just very low. Probably because of the natural prejudice against them. Even Momon was subjected to this when they saw his (illusion) face and discovered that he was a human from a southern nation. Elves are probably treated with much more prejudice as they aren't even humans. It does say however that it's rare for non-humans to become adventurers and there are a few non-human adventurers, however most of those are very high ranking so you can't really turn them down.

In my opinion I think it's just a matter of location, in elvish countries you would see a lot of elven adventurers and not many humans. In places where multiple races exist in harmony you would probably see adventurer teams made of non-humans and even non-humanoids.