Tetsuya Nomura wears various hats at Japanese game maker Square Enix. He designs games, he produces them, he directs them — he also designs characters! His artwork is perhaps the most influential of the Final Fantasy series. But it's sometimes easy to forget his pure artistic talent, and sometimes easier to get lost in his resume, whether that's the games he's made or is making.
The Final Fantasy 25th Ultimania art book has a good refresher, showing off some Tetsuya Nomura sketches of Final Fantasy XIII characters. The man is an artist and has talent to spare — and then some. For more sketches, have a look at FinalFantasyFXN.net (link below). Great stuff.
FF XIII Character Sketches from FF 25th Ultamania [FinalFantasyFXN]