Dot Pixis

Commander Dot Pixis (ドット·ピクシス司令) is a high ranking military officer in charge of the cities defense. He is the highest ranking administrator of the southern region, which includes Trost District. In matters of defense, he is given full authority.

Personality
Pixis is an eccentric man. While observing Titans breaching Wall Rose, he said he wouldn't mind being eaten by a Titan if "she happened to be a stunning beauty." He retains a calm, and light-hearted demeanor, even in the midst of chaos. Yet, Dot Pixis is an effective leader, as seen when he quiets all the soldiers attempting to mutiny and successfully convinces them to continue fighting to retake Trost. He is an expert strategist, and is able to gauge a situation carefully, but also knows when to take risks, which leads to his decision to trust Eren to stop the breach.

Story
In the anime, Pixis first appears during the Invasion of Trost, playing chess with a noble. A soldier appears and informs him of the situation in Trost, which required his immediate attention. Pixis decides to head over to the scene, calmly refusing the noble's request to stay and protect his property.

After it was discovered that Eren could transform into a Titan, Eren was sentenced to death. Dot Pixis, however, happened to be nearby when Armin gave a passionate speech in defense of his friend, vouching for the strategic and tactical benefits that he could bring to turn the tide of the battle. The officer in charge wasn't swayed, but as he was about to give the kill order, Dot Pixis stopped him, believing Armin's words.

After discussing the matter with Eren and Armin, he orders his officers to begin plans to recapture Trost. However, the Stationary Guard, already extremely low on manpower and morale after the evacuation, is in no condition to fight again and many soldiers attempt to mutiny in order to spend the little time they have left with their families.

In order to give the soldiers hope, he introduces Eren as being a part of a secret experiment to shapeshift into a Titan and fight them on equal footing. Unsuprisingly, Pixis is not taken seriously and violence is close at hand as mutineers and officers prepare to fight each other.

Finally, he gives an order to pardon all soldiers who wish to leave as they have been paralysed by their fear of being eaten by Titans and can no longer fight. He also states that by leaving, they will put their families at risk and expose them to the same dread that has paralysed themselves. This argument convinces the soldiers to reassemble their ranks and begin the operation.

Pixis would later appear when a member of the Survey Corps informs him and the others about Wall Rose being supposedly breached for the 2nd time by the Titans.

Trivia

 * The name "Pixis" may refer to the constellation "Pyxis Nautica" - Latin for "The Naval Compass".
 * In 2010, Isayama posted a blog post admitted that Dot Pixis, was modeled after General Akiyama Yoshifuru, a general in the Imperial Japanese Army.
 * In July 2013, a message board somewhere picked up this 2010 blog post, caused an Internet flame war among Korean and Japanese Internet users, including many comments threaten that they will beat the artist to death.