Invidia

In a world where murder is a business and torture an art, Death holds magnificent significance. Death is a reward; a terrifying and sometimes painful reward, but a reward nonetheless. Whether you go out in a blaze of glory or at the end of a rope, death is the final prize for a life lived.
Except for Hidan.
Hidan will live forever, working for his God and living as well as he can- he will never forsake Jashin, or loose the path of the righteous, and he will never, ever obtain the reward he wants. He can send as many people to their end as he wants; has already sent more than he can count. But the one thing he ever has really wanted is denied him.
And if he's envious of each poor fuck who's heart he stops, well... who can blame him?

Avaritia

Everyone knows he likes money. Everyone comments on it, at least once. They call him stingy, miserly, greedy.
Of course, he doesn't gve a damn what they think. They don't know the half of it; they are fools. It's not the money itself Kakuzu loves, it's the symoblism. Money is everything- you can pay for anything you can think of; food, lodging, sex, power... you can buy lives, should you so desire.
Let the idiots think waht they want. They would squander their money on trivilties, on overpriced food and clothing they don't need, on whores and shiney trinkets. And when they have no more, they will whine and make due until the next time they get paid.
Kakuzu will store his money and live how he wants- he doesn't mind a scarce lifestyle, as long as he knows he'll have the money when he needs it.

Acedia

It takes a lot to really get Hidan excited. He's sarcastic more often than not, and often would rather snark about the task at hand until being excused than simply do it. He's not even enthusiastic about his killings- he prefers to kill his victims quickly whenever possible.
Honestly he's not lazy- he's simply apathetic. After living so long and having so much longer to look forward, he sees no reason to feign interest in tasks he already knows to be mundane.

Ira

Asking Kakuzu why he's angry is like asking your mother why the sky is blue or why the wind blows. While it's likely that she once knew the real reason, chances are she's long forgotten and finds it easier to grant a superficial answer. The sky has always been blue; the wind has always blown; Kakuzu has always been angry.
He sees nothing wrong with that.

Gula

Never being able to die while taking part in a religion focused so deeply on Death, makes Hidan a kind of connoisuer of mortality. Once commited to it, he anticipates each kill the way a collector may anticipate the aquisition of a rare peice. He savors the end of his victim's life and looks forward for the next.

It's a morbid case of gluttony, he knows, but all in all he doesn't mind.

Superbia

Kakuzu is a very thorough person- everything he does is done to the end and done exceptionaly well. If he kills, there will be no witnesses; if he makes and investment, it is sure to pay off. He is not wasteful and he incredibly efficent. He takes great pride in these things, because he knows he's better than any of the others in Akatsuki.

Luxuria

The pain between them was perfection. The friction of bodies in motion, the agony of restraint; the heat and sound and smell of the other's body. They moved together perfectly, addicted to the sensation. Together they would slip into a sort of earthly heaven, gasping and moaning and growling eachother's names. Grappling as close as possible, minds blank with pleasure, they promised forver.

They would never admit there was anything other than lust behind it.