You also have established movies like Robin Hood with Kevin Kostner (and Morgan Freeman) where a black character from an area of the world, where the show doesn't take place, is part of the main cast.
Nothing would've stopped the RoP team to get 2-3 people from Umbar to be relevant characters. Make something up how they got there (and how they befriended other main characters) and why they are staying. Hell maybe let them have connections back to Umbar and when they need help 4-5 ships from Umbar arrive (with all black crews) to help out in a battle or something.
(I haven't watched RoP, so no clue if that would be viable)
You also have established movies like Robin Hood with Kevin Kostner (and Morgan Freeman) where a black character from an area of the world, where the show doesn't take place, is part of the main cast.
Nothing would've stopped the RoP team to get 2-3 people from Umbar to be relevant characters. Make something up how they got there (and how they befriended other main characters) and why they are staying. Hell maybe let them have connections back to Umbar and when they need help 4-5 ships from Umbar arrive (with all black crews) to help out in a battle or something.
(I haven't watched RoP, so no clue if that would be viable)