This whole thing is really funny
Let's say that the term Nijisister does have racist roots and is related to Nijinigger. That means Nijisisters were dumb enough to not research the origin and used it themselves without knowing.
If it doesn't have racist roots, then it is a case of Nijisisters being extra retarded.
And let's say somehow the world agrees to stop using the term because Nijisister truly is as bad as Nijinigger, then we just drop the hard R and call them Nijisistas, lmao