The theory that Yasuke was a black hero has gone too far. The person spreading this historical falsehood is the second Yoshida Seiji. Journalist's "outrageous remarks" by Takahashi Kanji

Yasuke appears in the "Nobunaga Koki," a biography of Nobunaga. One of the extant copies states that he was given a sword and a house, which is the basis for the claim that he was a samurai. At the very least, there is no record of him having achieved any merit in battle, so he was not a legendary samurai.