Famitsu celebrated the release of their 1000th issue with a 4 page interview with legendary game director and character designer Tetsuya Nomura. Unfortunately I cant read Japanese but here are a couple of things I have picked up while browsing a few sites.

Lightning from Final Fantasy XIII has muscular legs, she very strict to herself and others and she hates people whiners (see Tidus). She acts like a military and Motomu Toriyama wanted her to even be more muscular and macho but Nomura hought people wouldn't be fond of her as a main character if she was built that way. She's apparently a little less feminine than Aya Brea from Parasite Eve.

The outfit of the Final Fantasy Versus XIII character might get revised before the release of the game. He is not like Squall or Cloud like you might expect from seeing the trailers. Everyone's impression on him will greatly change once they hear him speak. Many people may not like him. His name will be related to weather just like Lightning (Cloud and Squall), but personally Nomura has gotten bored of this naming tradition.

Here are the four scans: Page 1, Page 2, Page 3, Page 4.