Rico Brzenska

Rico Brzenska (リコ・ブレツェンスカ) is the Squad Leader of the 1st Division Elite Force of the Garrison. She is the sole survivor of the elite squads assigned to protect Eren during the liberation of Trost District. She does not trust Eren and still views him as an unstable threat.

Story
Rico is first seen when Eren, Armin, and Mikasa are cornered by Kitts Verman. She agrees that they should be executed, because they could be dangerous. She later observed Eren in Titan going berserk. Rico hastily signals mission failure, but Ian convinces her to continue. When Eren recovers, she, along with the rest of the elite squad, cut a path to the breach. At one point, when a titan converges on Armin, Rico rams her swords into its eye and Mikasa finishes it off. When the rock is finally in place, she observes that everyone else is dead and they are later rescued by Levi.

She also testifies against Eren at his trial, convinced that he is a danger to himself and humanity.

Rico does not appear again until the Garrison is deployed against the Titans which have mysteriously appeared within Wall Rose. Rico is in charge of the Eastern line of defense, where her squad lures Titans into cannon fire and she uses her Three Dimensional Maneuver Gear to cut their necks while they're disabled.

Abilities
She is considered one of the most skilled members of the Garrison, earning her a place on the Elite Squad during the mission in Trost.

Trivia
In the anime, she appears to gradually trust Eren a bit more than she does in the manga. When she saw Eren finally gaining control of his Titan form and carrying the boulder, she was moved by the sight and realized the others didn't die in vain. Her thoughts of suspecting Mikasa concealing and lying to testify against Eren was never made in the anime, and she seemed rather ashamed or disgusted that she had to write in how he attacked Mikasa in the report.