This one is similar to hair in the fact that everyone has the right to express themselves how they like.
And things like nose piercings and snake bites are becoming more and more common.
The main point is, apply the use of these to a setting or context. Ear expanders didn't exist in the Wild West and things like lip rings aren't allowed in most political jobs.
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Anti Mary-Sue Character Guide
Non-FictionHere is just my list of tips of how to avoid creating/writing a Mary-Sue character. Take them as you wish. Greatest Achievements: #1 in non-fiction!!!