Well, as far as monster girls are concerned, there are two minotaur style girls, but the characters cannot get too far from human before I dislike it. To each there own. We are thinking about adding a mermaid style character, but I'm not sure. But yeah, currently just human, elves and minotaur styles.
Also, there is a character who is meant to have a more east Asian phenotype. But I understand the point. It feels weird to have too much more than that since this is meant to be a high medieval fantasy in a north European style. It seems hard to narratively justify a modern London style ethnicity mix. It would be easier with a modern or sci-fi theme.
In a fantasy setting, anything is valid. Depending on how mundane magic is, transportation stops being much of a problem. Even if only normal transportation is available, envoys, slaves, mercenaries, scholars, cartographers, monks, mystics, fugitives and merchants exist, not every character needs to be "a citizen born and raised where the game takes place". Embassies can also exist. Nomads have always been a thing in history, as are raiding parties that manage to settle in small areas. The only real question is whether the place "has any value" for people from outside, as in, "why would they even want to get there in the first place".
If you don't want darker skinned ladies in your game, that's ok. Saying it is "hard to narratively justify" is a
skill issue, whether for their presence or absence. The easiest justification is
"they visited a few times a decade or two ago, but saw nothing remarkable and moved on". A very similar one: "
they don't even know this place exists". A third, semi related:
"The place is far from the main trade routes and even merchants only visit to rest and resupply".
To make it simpler: "
They're not there (in the game land) because they don't have a reason to", they fail to answer the question of "
why be there in the first place". Bam, suddenly you have enough of an in-world explanation to only have white people instead of the lazy "fantasy north yurop"