Kapten Kuro

Worthy of his epithet, Kuro is a master strategist who has never once before failed in his village raids, due to him planning skillfully beforehand. He is the second most intelligent man in East Blue, and was skilled enough to have tricked the Marines into making them think he died, thus leaving him alone.

Buggy

While not as powerful as other former Roger pirates, Buggy is a fairly capable fighter who was strong enough to survive all the battles with Whitebeard's crew and the extreme dangers of the Grand Line. His arrogance and greed usually gets the best of him, preventing him from fighting at his fullest.

While he was a considerable villain at the beginning of the series, he become a lesser threat as more powerful enemies showed up. Finally, in the Impel Down arc, the Baroque Works members commented how weak or how much of a coward Buggy actually is. However, he is still able to survive the ordeals that even the more powerful people can (albeit with their help).