Mae Holland
She is the twenty-four year old main character of Dave Eggers's novel "The Circle", who ultimately serves as a wolf in sheep's clothing rather than an outright villain by the end of the novel.
Mercer Medeiros
Mae's ex-boyfriend, having dated her while she was in high school.
Annie Allerton
Mae's closest friend and former college roommate. At the age of twenty-six, she has been with the Circle for two years, is well-liked and well-respected by everyone, and even manages to have the ears of the Wise Men and the Gang of 40.
Frank Garaventa
Francis is a programmer who works in security applications at the Circle.

He meets Mae during a party at the Circle campus, and the two eventually begin a relationship, though their relationship is bumpy at times.

Tyler Gospodinov
He is the original of the Three Wise Men, having developed TruYou, and founded the Circle. He is about thirty, rarely seen in public, is brilliant, and many believe he has a slight case of Asperger's Syndrome.
Kalden
He is a mysterious man, perhaps about thirty, with gray hair, who meets Mae one evening on campus after a party.

Mae is immediately sexually drawn to him, meeting up with him several times for random sexual encounters.

Tom Stenton
He is the second of the Three Wise Men, brought onto the Circle by Ty in order to give the company a better business footing and future, and to increase the company's value. He resembles a 1980s-Wall Street tycoon, is not married, and has the business personality of a shark.
Eamon Bailey
He is the third of the Three Wise Men, brought onto the Circle by Ty in order to give the company a gentle human face, and to serve as a moral and emotional inspiration.

Bailey is a wolf in sheep's clothing, hammering away at people with velvet-gloved fists of steel. He emotionally and mentally manipulates people to his will, and has his best success with Mae, whom he completely brainwashes into unfettered loyalty for the Circle.