I'd say I'm bits of all of them:

Wakka: Sense of fun and humour
Tidus: I act before I think most of the time
Yuna: I can be extremely shy
Rikku: I can be extremely hyperactive (depending on how much sugar I've had)
Lulu: Being a teenager and all, I can be extremely moody and very forthcoming with people.
Auron: I can be a know-it-all some of the time.
Kimahri: I can be a very silent person sometimes. I don't believe in talking for the sake of it. That's what I have in common with Ents too. (only ppl who like LOTR will get that)