Akatsuki

Pein: [Wants to control the Tailed Beasts in order to control war and profit from it, thus eliminate pain and suffering] We've known this for a long time...

Konan: [She blindly follows Nagato!]
She is too overwhelmed by everything that has happened since she was a child, and is in a state of perpetual shock.

Kisame: [his motivation seems to be just to fight!]
Was partnered with Itachi, never seen him fight 100% Might just like fighting for the sake of fighting (like Kenpachi in Bleach)... However, he seems to want direction in his fighting... when Tobi revealed himself as Madara, he was relieved to see that someone with brains was behind his actions...

Zetzu: [He has nothing better to do?]
Ultimate two-faced villain. He seems to blatantly obey and betray both Madara and Pein to eachother... as if he is controlling the situation. Think of all the random battles he goes to... and who sent him to watch... But WHY does he go along with everything?

Madara/Tobi: [We don't know his motives]
We don't know if Madara is immortal, or just attached himself to a new body like Orochimaru and Kabuto. We don't know why Madara decided to create Akatsuki. We don't know if Madara is the influence that pushed Pein in the direction he is going...

* We do know that Madara is the mastermind behind all of this... and that he is using each of the Akatsuki members in a certain manner... to what end for each of them though...

Konan - is alive as a trump card against Pein
Pein - is alive in order to do the extractions
Kisame - is alive because he is powerful... AND IDK???
Zetzu - is alive because he spies for Madara
Sasuke - is alive beacuse.... IDK IDK???? Madara does have a BIG plan for him though, because Zetzu was watching Sasuke ever since his first fight with Naruto...