"will bring nothing but trouble" is an opinionated statement. not everyone may think he'll bring trouble.
a sentence with no bias would have facts that no one can argue, such as "two plus two is four". a sentence with bias shows an opinion, which anyone could disagree with, such as "my shirt looks very pretty".
Captain Nemo is a dynamic character because he develops throughout the book. He begins as a sort of an enemy and during the voyage he becomes a better man and changes his ways.
An argumentative statement is a statement, typically in an essay, which can be argued for or against. This statement is specific in order to be argued.
