The latest issue of V-Jump has been released and with it comes a scan of a brand new Final Fantasy XIII character. He isn't a character that was revealed at Jump Festa. In the scan we can see him fighting in a battle with Lightning which is the first time we've seen a battle with more than one character in the party. He's also supposed to be a starting party member meaning you'll be able to use him at the beginning of the game. BlankChocobo has translated more details from the scan:

"His name is サッズ・カッツロイ 'Sazh Katzroy', and he is a middle aged man. He dual wields pistols, has a baby chocobo, is a gentle hearted person easily moved to tears, possesses good judgment and a sense of social responsibility.