Thomas: The protagonist. Thomas is the last boy, but not the last person to enter the Glade. The only thing he knew when he came into the glade was his name. Chuck described him as about 16 years old, average height, and brown haired. He was called Greenie as he is a new arrival. He becomes a Runner with Minho after being the first person to spend a whole night in the Maze and saves Alby when he was about to die.
Teresa: The first girl to enter the Glade. She is thin, has black hair, blue eyes and is described as very beautiful. She is the last person who was put in the Glade. She has a telepathic connection with Thomas. She also calls Thomas "Tom." She is also known to help Thomas out of the maze and fight the grievers in the griever hole.
Alby: The eldest and the leader of the Gladers. "The dark-skinned boy with short cropped hair, his face clean shaven," tries to keep order within the group by having all the boys follow the rules they've set down to survive. He has a very close relationship with his second-in-command, Newt. He was in the group of 30 people who first arrived in the Glade. Alby commits suicide by walking into a group of Grievers, thinking that it was better that he die there than outside the Maze.
Newt: A tall, strong, smart boy with medium-length blond hair and a British accent. He is noted for saying "bloody" often in his speech. He used to be a Runner, but is no longer able-footed. He is very kind, friendly, and welcoming to Thomas. His nickname for Thomas is Tommy and they end up being good friends. He is Alby's closest friend and second-in-command and takes over as leader when Alby no longer feels capable.
Minho: The Keeper of the Runners - in charge of navigating and mapping out the Maze. He is very sarcastic, hotheaded, sassy and impulsive, but at the same time charming, smart, and loyal towards his friends. As a Runner, he's in very good shape and is described as "an Asian kid with strong arms and short black hair." He and Thomas quickly become good friends.
Chuck: A young and chubby boy with curly hair who was the newest Glader until Thomas arrived. He immediately becomes friends with Thomas and acts like a little brother towards him. Chuck was a "slopper". He is around 12 or 13 years old.
Gally: A Glader who lives by the rules Alby put in place. He does not trust Thomas and shows an immense dislike for him. He is also the Keeper of the Builders. He runs away from the Glade in a fit of rage after exclaming that he thought "Thomas was not to be trusted" in The Gathering.
Frypan: The Gladers' cook and Keeper of the Cooks. He is described as very particular, talented, and very, very hairy. Also known as "Siggy."
Clint: One of the two Med-jacks (which are the medics). The short boy with graying black hair works closely with Jeff healing victims of the Griever's sting with the Grief Serum.
Jeff: The taller of the two Med-jacks. He works closely with Clint healing victims of the Griever's sting with the Grief Serum.
Winston: The Keeper of the Slicers - in charge of slaughtering livestock for food. He is described as "an acne-covered kid, short but muscular" and seems to enjoy his job a little too much.
Zart: A big, black-haired, brooding boy. He is Keeper of the Track-hoes, who are in charge of farming. He often gives Thomas answers when no-one else bothers to tell him, making him a favourite in Thomas' eyes. Although, he is not his friend. He is often made fun of by the other Gladers.
Ben: A Runner. After undergoing the Changing and attempting to kill Thomas, while still quite induced with the serum and still psycho, he is banished to the Maze.