Jurassic Park: the Lost World Characters There are many characters in this book. Only one of these characters is from the origional. He is Ian Malcom. There are many people, though who take the place of the previos book's characters. There are Kelly and Arby instead of Timmy and his sister for example. There are many main and minor characters in this novel which are all very important to the story line. Ian Malcom is one of the main characters in the novel. The book starts with him giving a lecture Berkley University. He talks about Chaos Theory and how it implies to the extiction of animals. He is a Mathematition who specializes in Chaos Theory.