When Mikasa initiates the first death of a Titan in the series. She kills four total without breaking a sweat. The only other people with a higher Titan kill count than her are Eren in his Titan Form and Reiner. That makes her a One-Woman Army, acknowledged In-Universe.
- After this, her "The Reason You Suck" Speech to the guy who was blocking the gates with his merchandise because he thought it was more important than the lives of any of the people trying to get through.
Mikasa: What... are you doing?
Mikasa: Right now, my comrades are dying. Because the people haven't evacuated, they're dying, fighting the Titans.
Entitled Bastard: Of course! It's your job to sacrifice yourselves to protect the people's lives and fortunes! You parasites think you're so special just because you're finally being useful for the first time in a century!
and Slow Walk
commence) If you expect someone to die for the sake of another as a matter of course, I'm sure you'll understand this. That sometimes, a single noble sacrifice can save many lives.
Entitled Bastard: Try it! I've known your boss for a long time... I can decide your fate with a single word!
Mikasa: (casually knocks out all of his bodyguards) How is a corpse going to talk?