Look, you're still looking for a "there's a 0'00874% chance you'd meet a black person in a 15'4km^2 area" kind of answer. That's not going to happen. Still, we can try and see how the society was during those times.
1. The most important:
travelling in the middle ages. I sat through it (not that difficult, it was very interesting). I don't know if you'll listen to it, but here's one major point: at a good pace, you could normally do 12 miles a day. It was also very expensive, difficult, and you couldn't be sure you'd find a food source on any given time. Not something the regular Joe would try to do.
2. I've already linked a source on how Jews were treated even in more recent times than 1403. If you read some of it, "Jews in Bohemia", as close as it gets; you'll see that they were treated poorly, and documentation on them starts on the XVIII - XIX century in many cases. In several cities, if they had a business in said city, they'd have to sleep outside of town! How's that accepting?
Also, keep in mind there was a thing called
blood libel. Do you think that a portrayal of a Jew being a regular member of society is accurate?
3. Romani people. You wouldn't meet any Romani people until the
mid XV - early XVI century. See how they regular people treated the Jews, which where people that had been born in their country, lived there, and probably didn't look all that different. How do you think people would react to travellers with dark skin and a different language?
"The Roma brought this letter with them when they arrived in France, and because it was issued in the Czech Lands (La Boheme) and by the Czech King (roi de Boheme), the French people named the newcomers after the land from whence they came, les Bohemiens.
The first to observe that the Roma were not servants of God was the Church. This was also began their persecution, which was soon joined by the secular powers, which saw the Roma as Turkish spies."
"The persecution of the Roma at the end of the Middle Ages and the beginning of the Renaissance belongs among the darkest pages of European history. Europe never really accepted them, due to their dissimilarity, and also in part to the fact that they often found provisions on their travels by stealing, which was then used as justification for their persecution. In the first few centuries, the ill will they generated among the locals was offset by their migration to a new region, where they weren't yet known. The Roma's life was never easy, they were always among the poorest population groups, and supposedly Christian Europe never behaved towards them in a very Christian manner."
4.
Mongol invasion. Not only they didn't reach Bohemia, but they didn't keep the Polish cities they conquered for too long. The 2nd and 3rd invasions were mostly sacking, so pretty irrelevant for this matter. They were invaders, people that had sacked their cities. I don't think they had much sympathy for them.
5. "
Bohemia was spared the horrors of the Tatar invasion".
6. Cumans. They didn't reach Bohemia, they did however settle in Hungary. Also, according to
investigation, despite coming from Asia they were genetically related to Western Europeans, and they were refered to as "the blond ones". Not that different from the local population after all (in Hungary, that is, not in Bohemia so not relevant).
"
They were called Kun (Qoun)/Kunok by the Hungarians, and Polovtsy/Polovec (from Old East Slavic "половъ" — yellow) by the Russians — all meaning "blond"
7. Moors. The Moors reached the Iberian Peninsula, Sicily and Malta, not taking into consideration northern Africa for this matter. How easy do you think going through the Pyrinees or the Alps was? Not only that, but they'd have to go through christian kingdoms first, kingdoms such as Castille or Aragon that would go on to:
a. Have them convert to christianity.
b. Not trust they were sincere, kick them out of their lands (along with the Jews).
Also I think you're overestimating the presence of Moors in Europe. This is what remained of the Moors
in the Iberian Peninsula in 1250 - 1300, a small kingdom called the Emirate of Granada. This is what
Moor presence was left on the Italian Peninsula in 1084.
In the Italian Peninsula,
by mid XIII century, there was no Muslim population. I would bet that the few that remained, if at all, wouldn't risk going to France or crossing the Alps just to see how beautiful old little Prague was.
8. Black people from Africa. Not everyone from the African continent is black (we wouldn't have points 7 & 8 if they were, just point 7).
In the Middle Ages, slaves did exist,
but they were the result of people captured in wars and they were normally Europeans, Nordic (Europeans as well), Moors or from the parts of Asia closest to Europe.
It wasn't until the XV century that the slavery of Africans started to happen. So, not only were there little to no black people in Europe beforehand, but the ones that started arriving were slaves, and almost nobody had seen a black person before, especially true if you're from a small rural village in central Europe.
9. Trading. East Asians. See #1. A trader from China wouldn't go all the way to Prague to sell silk. There' no way you would meet a Chinese person. At most, you'd meet a traveller from a few cities away; and again, that's if you live in Prague, not in a rural village. If you live in a rural village, there's probably a merchant in your village or in your area that goes back an forth from Prague to trade stuff there and bring new goods home.
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So, I can't prove that there were no black people, Jewish people, Asian people in a 9km^2 piece of land in the town of Kickapoo, but the chances are nil. And the chances of any of these people living exactly like a white person are even less.
It's historically unaccurate to include different ethnicities as members of the society of rural Bohemia. If you have proof that shows otherwise, please share.
