So am I the only Australian to comment in this thread? I guess I can provide some perspective on Vanille and Fang's accent.

I've got to say, I was shocked when I first heard Vanille. I looked at my friend who was playing and went "What?! She's Australian!" It is very, very strange hearing Australian accents next to American ones - it makes me realise how strange my own accent is to other people. Throughout the whole game Vanille's accent sounds normal to me, so I don't understand what people are talking about when they say she slips between British/American... the only thing that sounds weird is the way she inflects some things and the unnatural high pitched voice, but otherwise she sounds like a regular Australian girl.

Fang, ah Fang. Well, Fang sounds like a bogan. Especially in battle when she yells "Appreciate it!" I laughed at that. A bogan, for those who don't know, is the Australian equivalent of white trash, and its a very particular accent that screams uneducated, lower class, etc... so its really jarring for an Australian to hear Fang talking like that.

Listen to this clip: YouTube - Australia's Got Talent 2009 - Kath and Kim

Not sure about the rest of you, but I can hear the difference between the presenter's accent (normal Australian) and the Kath & Kim impersonators (the two weirdly dressed women - bogan Australian).

Anyway, I've gotten used to it and I think it suits Fang. She's kind of rough and tumble, a bit derelict, and the accent suits that... even though its not really a compliment, but whatever.

As for all the other voices, I love them. Lightning is as someone else said perfectly stoic and calm, but compassionate at the same time, a really well done voice. I love Hope's voice - it's cute, and young, and mature at the same time. His actor brings out Hope's insecurity but allows him to grow up at the same time. Sazh and Snow, yes, excellent. Very happy with the VA work in this game.