How about the Tyroc issues of LEGION in the mid/late 1970's:




A black militant character who came from a centuries-segregated island of black separatist racists. As I recall, Grell disliked the character, as did Paul Levitz. To the point that it was quietly drifted out of continuity.

As I recall, Tyroc appeared in SUPERBOY/LEGION 216, 218, and 222.