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Fans of romantic stories, especially those who have a penchant for stories with a bit of a twist like dating an ex, would probably be interested. Also, individuals who are into exploring different relationship dynamics through fictional works might find 'Dating My Ex Part 1 Fun with Fan Fiction' appealing. Since it's in the form of fan fiction, it may attract fans of the particular genre or the original source material that the fan fiction is based on.
Well, good character development is crucial. The characters need to be relatable and have interesting personalities. Also, a unique and engaging plot is a must. Maybe a bit of humor and some heartfelt moments too.