Mary Sue characters in PBEM games
Barb of PBEM2.com posted a very interesting piece about "Mary Sue" characters. A "Mary Sue" character is described as a character create to be a better version of the player himself. Such characters tend to be too perfect and without flaws. While creating a character for your PBEM game based on yourself is fine, "Mary Sue" characters are often bordering to godmoding.
You can read more about it here: Recognizing the Mary Sue character and learning how to avoid her