So by this point, once you've decided on a story and where you want your character to fit in, you'll start visualising you character. Maybe even have a full idea what you want your character to look like.
Just a warning, this will be a long section since there's a lot we can decide about a characters appearance and, if anyone's played the sims, the character design is the best part.
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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!!!