Zero AKA Hector ZeroniZero is the best digger and generally thought to be stupid by a lot of people at camp. In truth, Zero is very smart and good at math, although he was never taught how to read.
Stanley Yelnats
Mr. PendanskiMr. Pendanski is in charge of tent D, Stanley's tent at Camp Green Lake. He seems to be friendly but really he is just as mean as the Warden and Mr. Sir.
The WardenThe Warden is the ultimate symbol of cruel authority at Camp Green Lake. She rewards only those who do what she wants and uses her power to threaten everyone else.
SamSam and Kate were in love one hundred and ten years ago. Sam knew how to make many medicinal remedies out of onions and he was strong and smart. He also loved his donkey, Mary Lou.
Kate BarlowKate Barlow is the schoolteacher-turned-outlaw who robbed Stanley's great- grandfather. She lived on Green Lake one hundred and ten years ago, when there was still water in it.
SquidSquid is another boy at the camp. He is as tough as X-Ray, although he often follows X-Ray's directions. Squid often taunts Stanley about receiving letters from, and writing to, his mother.
X-RayX-Ray is the leader of the group of boys at Camp Green Lake. Although he is small and cannot see well, he manages to take charge and have the other boys follow his orders.
Stanley Yelnats IThe first Stanley Yelnats is the son of Elya Yelnats and the great-grandfather of Stanley. Kate Barlow robbed the first Stanley Yelnats of his fortune. He survived by climbing to the top of a thumb shaped mountain (which he called God's thumb) which happened to be Sam's old onion field.
Madame ZeroniMadame Zeroni is the great-great-great-grandmother of Hector Zeroni, Stanley's friend at Camp Green Lake. She gave Elya Yelnats a pig but when he broke his promise of carrying her to the top of a mountain she might have put a curse on his family.
Others
- Magnet- Mr and Mrs. Yelnats- Mr. Sir- Armpit- Clyde Livingson