I hate the cartoon-character version of the knight -- always have, regardless of the face, although this one is better than some in the past -- but you need one since obviously a knight on horseback won't work indoors. But for football games, only the knight on horseback -- at least for home games, anyway -- is preferable, and that person has no color behind the mask. Or gender, for that matter. Anyone who can handle a horse and fit in the costume can be the Scarlet Knight.
But the idea that the cartoon mascot needs diversification is beyond the normal foolishness that goes on around campus. What's next? The Notre Dame leprechaun (how are Native American mascots insensitive portrayals of a culture but that thing is allowed to cavort on the sidelines?) has to be Asian?