* Professor George Edward Challenger: A renowned but eccentric scientist who discovers a plateau in South America inhabited by prehistoric creatures. He is the driving force behind the expedition to the Lost World.
* Lord John Roxton: A fearless and experienced hunter who accompanies Challenger on the expedition. He is known for his bravery and skill with firearms.
* Edward Malone: A young and aspiring journalist who joins the expedition to cover the story. He is initially skeptical of Challenger's claims, but eventually becomes a believer.
* Professor Summerlee: An aging and skeptical zoologist who is initially reluctant to join the expedition, but eventually agrees to go along to prove Challenger wrong.
* Inez (née Gladys) Huxter: A young woman who accompanies the expedition. She is the daughter of the expedition's financier, and is initially romantically interested in Edward Malone.
While these are the main characters, several other characters play important roles in the story. They include:
* Zambo: A native guide who helps the explorers navigate the jungle and provides crucial assistance.
* The natives of the Lost World: The primitive people who live on the plateau and have a symbiotic relationship with the dinosaurs.
* The dinosaurs: The various prehistoric creatures that inhabit the Lost World, including the Iguanodon, Pterodactyl, and Allosaurus.
The interactions and journeys of these characters form the backbone of *The Lost World*, culminating in a thrilling adventure that tests their courage, resourcefulness, and beliefs.