If historical authenticity is semi-expected then having Samuel L Jackson as Nero isn’t going to fly. If race swap is part of the gimmick like in Hamilton then I don’t think it would matter.

If going for visual realism, then obviously a black man would not look the part, since all roman emperors were caucasian (except possibly Septimius Severus).

A latino man could almost certainly fit, though.

sed 's/ b/\u&/' || sed 's/ L/\L&/'