Dot Pixis

Dot Pixis is a high ranking military officer in charge of the cities defense.

History
He is the highest ranking administrator of the southern region, which includes Trost. In matters of defense, he is given full authority.

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

Pixis would make his appearance again in Ch.36 when a member from the Scouting Legion informs him and the others about Wall Rose being breached for the 2nd time by the titans.