Captain Dola is woman who is hard on the outside, but quite soft at heart. In the beginning of the film, she was one of the bad guys; she invaded a passenger air ship, she fired at people, and she led her crew on a violent chase after Pazu and Sheeta on the railroad tracks. However, she really wasn't that bad a person, just a person who was temporarily blinded by the vision of riches.
Mooska, like Sheeta, is a descendent of the Laputians who once lived in the castle of the sky. He joined the government as a means of using their resources, while secretly planning his own agenda. He did not care about the gold or the jewels or diamonds, because he knew none of them could even remotely represent what Laputa was worth.