Board Thread:Off Topic/@comment-25396609-20171116191014/@comment-26397825-20171129010028

It's not just OPness that makes a Mary Sue. It's also adding random 'special' traits for no other reason than to make them look special. Such as metallic heterochromia. Heterochromia on its own is fine. Metallic on their own is fine. Together? That's just for the 'specialness' of it.