How can you possibly think that Lulu, Tifa, Garnet and Rinoa look alike?
The only quasi-incarnation would be Tidus and Shuyin.
By the way, "that guy in FF12" is Vaan, and he looks nothing like Tidus and far less like Cloud. If you just look at him a bit you'll notice that he's got a lot of different features. He wasn't even designed by Nomura.