Nile Dok

Commander Nile Dok (ナイル・ドーク師団長) is the chief of the Military Police. Nile Dok appears at the trial of Eren Yeager, where he planned to have Eren studied and then killed.

History
Nile was a member of the same Trainees Squad as Erwin, and the two were good friends. They enlisted in the Survey Corps together, but then Nile met a woman named Marie at the bar the group often frequented. Both men fell in love with her, but Nile ultimately chose to abandon his comrades to be with her. He enlisted in the Military Police Brigade, and started a family with Marie.

Plot
Although Dok did purposely try to kill Eren, he analyzed and weighed the different pros and cons of Eren before making his final decision. He recognized that Eren's Titan powers had saved Trost District, but threaten the balance of power within human society. While mainly business and Wall Rose residents support Eren, most people of importance such as the clergy, view Eren as a danger. Thus, Dok concludes that to avoid civil war, Eren must not be allowed to live. When Eren called him and his group of bunch of cowards, he wanted to have him killed; however, Levi interfered by beating Eren in front of everyone. When Zacklay placed Eren in Survey Corps, Dok is displeased that he lost the trial; however, he asked Erwin Smith how the Survey Corps going to perform a mission to Wall Maria.

He would later learn from the Commander Erwin Smith that Annie Leonhart was the female Titan and that Wall Sina has been breached. Going by his suspicions, Dok ordered Marlowe, Hitch and the other members to assist the Survey Corps in capturing Annie.

The meeting for Eren's judgement is put on hold when Smith and Dok were ordered to attend a meeting to discuss the recent turn of events. However, they learn that Wall Rose has been breached and rush to investigate.

He meets with Erwin in the Capitol, and it is revealed that they were once close friends during their time in the Trainee Corps. Erwin questions him about the Military Police Brigade's involvement in Pastor Nick's murder and learns that Nile doesn't know anything concerning the Central branch's activities. He states that no laws exist that can restrain that group, and admits that he doesn't know if handing Eren over would resolve the current crisis.

Erwin inquires about Marie, who is expecting their third child. Nile initially tells him not to change the subject, but the two men end up reminiscing about the past. He admits that he betrayed his comrades by abandoning them, but states he does not regret his decision because his family is his greatest achievement. Erwin admits to respecting his old friend, and the life he has managed to build for himself -- something no one in the Survey Corps can ever have. Still, he offers Nile a vague warning about the future and advises him that protecting his position and protecting his family may not be the same thing. He makes several cryptic statements about their friendship, and reminding Nile that they trust each other before exiting the carriage.

In parting, Erwin admits to having had feelings for Marie. Nile is startled, but admits he knew that and always thought Erwin insane for choosing the Titans over her. As the carriage pulls always, his expression darkens as he considers Erwin's many mysterious statements. .

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Nile Dok