Rename and rewrite Overused Copycat Character to be less overwhelmingly negative with more focus on the phenomenon in professional works. Make sure this sort of thing actually happens in professional works. If so, draw a clear line of where this differs from a Trope Codifier.
Send the idea of self-designed player characters tending to be ripoffs to YKTTW to see how it fares. If/when it becomes a trope, note on both pages how the first trope tends to set in motion the second.