In modern fiction its hard to create fresh new characters that are unique and can take the eye of the reader. But there is a problem with doing this, too much into that character can walk him or her into the land of the Mary Sue and Gary Stu. For me its very hard Sueproofing, as my stories are set around super hero like elements. Creating a super hero genre story is a real pain in the you know what, as make the heroes too powerful you make them unsympathetic. Make them too weak and no one wants to read about your heroes. I Have done my best to walk the middle ground with my characters, having characters that have superpowers yes but making sure no one character is not more powerful then the other. Character balance has been my way of Sueproofing, having measures to make sure that the Mary Sue/ Gary Stu effect is all but eliminated. But still its tough, what do you folks do to Sueproof your fics?