Vincent! *looks at avvie and sig* yup it's obvious i'd say that! Hes just a cool character, with his tortured past and how he kicks himself for not being able to save Lucretia, and how because his attempts failing, Sephiroth was created, and he now has to live with his transformations and emotional scars. He also wears BLACK CLOTHES AND A RED CAPE! HOW COOL IS THAT?!
Cid is my 2nd favorite though, with his witty humour, swearing and how he works for his team and takes on responsibilities to help the others. Hes also the one who understands Vincent the most.
Red XIII is my third favorite. A red dog/wolf/fox thing who lives in a canyon and respects the working of the plannet. Also how hes wise above his years, and the fact that he outsmarts the humans.