There were very few characters in "20,000 Miles Under the Sea". There were only four and a half with names. 1 Nico Robin: The protagonist of this book is a smart, brave, and adventurous scuba diving man. 2. Jacques Lafont: He was another diver, a friend and colleague of Captain Nemo. 3. French biologist (MHDZO): He is an explorer who came to Earth to look for givets. Under the leadership of Captain Nemo, he went to the bottom of the sea. 4. The Chef: He is Captain Nemo's assistant and provides food and drinks to the crew.