It's simple really. Just take this template and add fields you think are needed as well as removing ones you think aren't. Make sure to have a personal touch to the characters, like a brutish warrior who likes butterflies.
Name : Joe Hantana
Birthplace : Los Angeles, California, America
Age : 32
Eye Color : Blue
Weapon : Jericho 941 (Baby Eagle) Semi-Auto Pistol
Favorite Food : Baloney Sandwiches
Turn Offs : The Drug Trade
Bio : Hantana started off as a street punk stealing dimes off of street vendors. He quickly grew into a hardened criminal, joining the Los Destroyaz (a Mexican crime gang with a serious rep) at only 23. He spent seven years in the gang before leaving to work solo. He's a man for hire, joining any group with enough money to pay him.