I've been back and forth on this matter over the years, but as of present: 

https://www.roleplayerguild.com/posts/5606410

Sarah. She's come and gone over the course of the years. She's been rewritten into multiple RP universes across multiple forums. She's easily the character whose creation I've agonized over the most becuase I want to do her justice and make her more than just an RP character; I've occasionally delved into the world building to give her a unique origin universe (though that project is slow-going at the moment). In the RP context, she would be my most recurring character, and most likely to exist across multiple RPs.