I think anybody that accuses someone else about "culture appropiation" deverves to be thrown through a cliff.
Regarding wokism yes, you have a black and woman main characters because of wokism. In this case to place a black guy in feudal Japan may be weird, but it's true that in this century Portuguese and Spanish brought there black slaves and servants. They were a very small part of the population, but there were many of them.
Yasuke was a real black guy brought there as a Portuguese Jesuist priest bodyguard, a very tall (188cm when average people were around 150cm) and muscular guy. Nobonaga Oda, one of the big lords of the time, got very impressed because he was the first black guy he saw and made him bath in front of him to see if he really was black. Bathing him shown him even more black.
He liked Yasuke, and claimed he had the strength of ten (Japanese) men, so "adopted" him, trained him as his personal bodyguard and also as the guy who carries his weapons -so pretty likely a samurai-, and gave him a personal house, and also allowed him to live in his castle and he also supposedly got his own personal weapons. So maybe wasn't a real/proper samurai, but did put him in his close circle, Nobunaga for sure didn't consider him a random slave or servant: respected him and was confident with him, making him part of his inner circle in a warring period where there were a ton of spies/ninjas waiting to kill or poison these lords everywhere.
Yasuke fought in different battles under Nobunaga's orders until Nobunaga got killed by other lord, they got defeated and had to surrender. That other lord decided to don't kill Yasuke because "he's an animal and knows nothing", so Yasuke got free and nothing is known from him in historical records, even if it's assumed that he travelled back to his home African country.
Most of these things obviously aren't confirmed historically, but there are many hints that lead to think he wasn't a random guy, and for sure he got in the inner circle of Nobunaga, which today would be the equivalent of being a SVP of Sony or Blackrock.
I think yes, they forced to put there a black guy because of wokism, but also think that the story of Yasuke is interesting and could be a cool character, as happened in Afro Samurai.
"I wanted to slay as a Japanese ninja"
My guy, who do they think this is?
She is a kunoichi, a female shinobi/ninja. Who were normally used as spies or honey traps to seduce, poison and kill targets, who sometimes even fucked or even married.
So their role was a different from the traditional (male) ninja, who often were also spies and sometimes also assassins.