I think Kisame had the best ending because, when they was trying to get intel out of him, he bit his own tongue off, to break the jutsu. Also, he killed himself so they couldn't get any intel out of him, and he know he couldn't beat all of them at once. And to top it off, he manage to trap Naruto, Guy, Killer Bee, and I don't know the other guy name in a water prison jutsu, while the original shark with the scroll got away. He died the way a true Shinobi suppose to.