Hero, Natasha Romanoff from Avengers (2012)

Clint Barton: [Natasha has freed him from his restraints] Tasha, how many agents did I-?
Natasha Romanoff: Don't. Don't do that to yourself, Clint. This is Loki. This is monsters and magic and nothing we were ever trained for.
Clint Barton: Loki, he got away?
Natasha Romanoff: Yeah. Don't suppose you know where?
Clint Barton: [Shakes head] Didn't need to know. Didn't ask. He's gonna make his play soon though. Today.
Natasha Romanoff: We gotta stop him.
Clint Barton: Yeah, who's "we"?
Natasha Romanoff: [Shrugs] I don't know. Whoever's left.
Clint Barton: Well, I... if I put an arrow through Loki's eye socket, I'd sleep better, I s'pose.
Natasha Romanoff: Now you sound like you.
Clint Barton: But you don't. You're a spy, not a soldier. Now you want to wade into a war. Why? What did Loki do to you?
Natasha Romanoff: He didn't, I just...
[pauses]
Clint Barton: Natasha.
Natasha Romanoff: I've been compromised. I got red in my ledger. I'd like to wipe it out.

- Natasha Romanoff from Avengers (2012)

Cognitive re-calibration, Natasha Romanoff from Avengers (2012)

Natasha Romanoff: [Clint is waking up from Loki's mind control] Clint, you're gonna be alright.
Clint Barton: You know that? Is that what you know? I got... I gotta go in though. I gotta flush him out.
Natasha Romanoff: You gotta level out, that's gonna take time.
Clint Barton: You don't understand. Have you ever had someone take your brain and play? Take you out and stuff something else in? You know what it's like to be unmade?
Natasha Romanoff: You know that I do.
Clint Barton: Why am I back? How'd you get him out?
Natasha Romanoff: Cognitive re-calibration. I hit you really hard in the head.
Clint Barton: Thanks.

- Scarlett Johansson as Natasha Romanoff from Avengers (2012)

Hero, Iron Man 2 (2010)

[Tony Stark is eating a donut in the giant donut on top of the building]
Nick Fury: Sir, I'm going to have to ask you to exit the donut.

[In the Donut shop]
Tony: I told you I don't want to join your super secret boy band.
Fury: [laughs] No no no, see? I remember, you do everything yourself. How's that working out for ya?
Tony: It-It-It-It's... I'm sorry, I don't want to get off on the wrong foot. Do I look at the patch or the eye? Honestly, I'm a bit hungover. I'm not sure if you're real or... or if I'm having deliriu....
Fury: [interrupts] I am very real. I'm the realest person you're ever gonna meet.
Tony: Just my luck. Where's the staff here? [looks around]
Fury: [pulls down Tony's collar to look at the marks on his neck] That's not looking so good.
Tony: It's been worse.
Agent Natasha Romanov: [walks up to the table] We've secured the perimeter. But I don't think we should hold it for too much longer.
Tony: [learning for the first time Natasha's true identity] Huh... you're... fired.
Natasha: That's not up to you.

- Scarlett Johansson as Natalia Romanova from Iron Man 2 (2010)

Hero, Loki & Natasha Romanoff from Avengers (2012)

Loki: Your world in the balance and you bargain for one man?
Natasha Romanoff: Regimes fall every day. I tend not to weep over that, I'm Russian... or was.
Loki: What is it you want?
Natasha Romanoff: It's really not that complicated. I've got red in my ledger, I'd like to wipe it out.
Loki: Can you? Can you wipe out that much red? Drakov's daughter, Tugenov, the hospital fire? Yes, Barton told me everything. Your ledger is dripping, it's gushing red, and you think saving a man no more virtuous than yourself will change anything? This is the basest sentimentality. This is a child at prayer... PATHETIC! You lie and kill in the service of liars and killers. You pretend to be separate, to have your own code, something that makes up for the horrors. But they are a part of you, and they will never go away!... No, I won't touch Barton. Not until I make him kill you! Slowly, intimately, in every way he knows you fear! And when he wakes, he'll have just enough time to see the work he's done, and when he screams, I'll break his skull! This is my bargain, you mewling quim!
Natasha Romanoff: [fearfully] You're a monster!
Loki: No, you brought the monster.
Natasha Romanoff: [back in normal state] So, Banner... that's your play.
Loki: What?
Natasha Romanoff: [on intercom] Loki means to unleash the Hulk. Keep Banner in the lab, I'm on my way. Send Thor as well.
[walks out]
Natasha Romanoff: [to Loki] Thank you for your cooperation.

- Avengers (2012)

Hero, Scarlett Johansson as Natalie Rushman from Iron Man 2 (2010)

Natalie Rushman: I need your impression.
Tony Stark: Well, you have a quiet reserve about you...
Natalie: I meant your fingerprint.

- Scarlett Johansson as Natalie Rushman from Iron Man 2 (2010)