Marcus Eaton is the father of Tobias Eaton and leader of Abnegation. He was married to Evelyn Johnson-Eaton. He's the only living council member of Abnegation after the attack by the Erudite faction and the simulation-controlled Dauntless in Divergent.
Marcus is first mentioned while the Prior family is having dinner. He is the city council leader whom Andrew Prior reports to. Erudite has recently published reports accusing Marcus of abusing his son, Tobias, and that's why he chose to transfer from Abnegation to Dauntless. Andrew tells his children, Beatrice and Caleb, that it's not true, and the Erudite are just making up stories to discredit him due to the Erudite's disliking of the Abnegation.
He is abusive to his son (Tobias Eaton/Four)
Marcus, as an Abnegation leader, makes a speech on Choosing Ceremony when both Beatrice and Caleb are deciding which faction to be a part of, talking about how the faction system was created in order to bring peace to their society after war happens. After his speech, Beatrice chooses Dauntless, while Caleb chooses Erudite.
Marcus is later seen when Beatrice, now going by Tris, goes through the fear landscape of Four, her Dauntless training instructor. She finds out Four is actually Tobias Eaton, Marcus' son, and that Erudite was correct when they accused Marcus of beating Tobias. When Marcus shows up in Tobias' fear landscape, Tris prevents Marcus from hitting him with a belt, instead grabbing the belt and hitting him. Tobias later shares with Tris how he never wanted to be part of Dauntless leadership when he was asked to because he didn't want to speak to or see his abusive father.
Marcus is later seen with several Abnegation members hiding out from Dauntless soldiers, who are under simulation by Erudite to destroy Abnegation. Tris comes there, looking for Andrew. She tells them about the simulation, and says she can shut it down by getting to Dauntless headquarters. Marcus comes with Andrew, Caleb, and Tris to Dauntless. When Tris shoots Peter in order to get information, Marcus is upset because, like most Abnegation, he believed that the act of violence was unnecessary. Tris reminds him, though, that Abnegation members' lives are at stake while the Dauntless each become murderers. Andrew later sacrifices himself in order to help Tris get to the control room.
Tris is able to shut down the simulation with help from Tobias, who was under simulation at Dauntless until Tris helped him fight out of it. Tobias recognized Tris' voice and was no longer under the simulation. Marcus is later seen when Tobias and Tris find him and Caleb, and he hugs his son, though Tobias is scared of him. Tris shoves Marcus away, and tells him she knows he abused Tobias. Marcus tries to deny it, but Tris sees right through it. She tells Marcus that Tobias has a right to shoot him, but if he doesn't stay away from Tobias, she'll shoot him herself. Marcus turns away, not able to say anything to her. He later gets onto the train with Caleb, Peter, Tobias, and Tris so they can escape to Amity headquarters.
He is again seen in the Candor Headquarters, where he reveals himself to be a Divergent. Tobias beats him up in the cafeteria there to prove he is not afraid of Marcus.
In Allegiant, Johanna recruits Marcus into the Allegiant (though she tells him they are no longer friends). In the end, when Evelyn came to negotiate a treaty, Johanna reminds Marcus that she is the leader of the Allegiant and accepts Evelyn's offer as Marcus was about to decline it.
Marcus and his son are not on good terms. Marcus was a recurring feature in Tobias' fear landscape, bringing back memories of his childhood beatings and later on showing his fear of becoming like Marcus. Marcus had abused his son on countless occasions for sometimes no reasons at all. In Insurgent, Tobias attacks his father in front of a large crowd of Dauntless when trying to prove he is not a coward, as Dauntless members had been teasing him for running from Abnegation and his father. They had been told of Tobias' past with his father when Tobias was given Truth Serum from Candor and was to spill his secrets to everyone.
Evelyn Johnson/EatonEvelyn is Marcus' ex-wife, However, Evelyn had an affair and may or may not have been exiled from Abnegation. In Allegiant, Marcus' fate is with Evelyn, but she chooses to exile him rather than kill him. Edit
Marcus has uneasy relationship with his son's girlfriend. Originally Tris' father is very good friends with Marcus but Tris is unaware of the truth of what he had done to his son,Tobias. Later, when she finds out that he abused Tobias, However, by the end of Insurgent they form an unlikely alliance in order to retrieve crucial information and delete Hentai from Jeanine's computer in the Erudite compound. Even though they form an alliance Tris ocassionally gets very mad at Marcus and warns him that she will never help him if someone tries to kill him.
We first see Marcus and Johanna together in Insurgent. They have been friends for a long time. However in Allegiant, Johanna Reyes finds out the truth about Marcus' cruelty to Tobias and refuses to be his friend any longer.
Peter and Marcus seem to get along well. While Tris, Tobias, Caleb and Susan escape Amity together, him and Peter also ally to get out.
other than being allies they are nothing else.
Marcus is described as looking similar to his son Tobias particularly as having similar colored, dark blue eyes. Because of Abnegation tradition, his hair is shaved close to his head.