There are 5 main characters in the story Flush. To start things off, were gonna talk about Paine Underwood. In the beginning he is in jail for sinking The Coral Queen because he knows that they are dumping the waste from the toilets into the ocean, which he doesn't like. In the middle of the story, he escapes from jail. Surprisingly, the jail officers don't mind at all. When he gets out, he knows that the Coral Queen is still dumping their toilet waste into the ocean, but doesn't want to be too involved in it anymore; he just wants to live a normal life with his wife in kids.
I think a trait that best describes him is a tree-hugger because he loves the environment and doesn't like it when harm is done to it.