Okay, so after playing this game, there are definitely some similarities.

Snow - Definitely a lot of Seifer in there. Not just the coat vibe, but the whole "I'm the hero in a story" thing going for him. And some Zell/Wakka.

Lightning - Ashe. Their character model even looks similar for some reason.

Hope - Reminds me a bit of Vaan and Larsa.

Vanille - A bit of Rikku and Penelo. Although a bit more like Rikku (sorry, I found Penelo the most pointless character in any game ever). And Cait Sith for some serious WTF moments (the sheep wool anybody).

Sazh - I can't think of anyone. But seriously cool.

Fang - Kimahri from a gameplay point of view. Also in the whole stoic thing. Perhaps a bit of Squall. And Vincent. But she's Australian which just makes her a lot more awesome and cheery about the whole thing.

Jihl - Naughty Quistis.

I'm sure more will come along later. Do you guys agree? Disagree? Who do you think is similar to previous characters? Or to anyone in the world? And don't you think Squenix should perhaps start getting some new characters. There does seem to be an awful lot of recycling going on.