I've had a good amount of characters come and go, but my first one came from way back in '10 or '11 when I used to stalk the Warrior Cats forums. Her name was Kayla Quietwhisper and she was your typical self-insert 'RUNDUHM LULZ' character, just one harem away from being a Mary-Sue. Her personality was so off the walls contradictory and she had your typical tragic backstory that basically boiled down to "Life was hard". No specifics. Just "Life was hard". Still, I loved her and used her as much as I could.