After being captured and cocooned, Miller manages to free an arm, grab a gun, and kill the facehugger that lept at him.
The Xenomorph known as Grid gets a few. Most notably killing two of the three Predators by herself, the first through a surprise attack from behind and the other through a full-out brawl. And even though she doesn't get into an actual fight with Scar, she's shown to be smart enough to avoid getting killed by him.
Lex manages to kill two Xenomorphs and holds quite a bit of the responsibility for the defeat of the Queen as well. Made especially awesome as she was never armed with anything more useful than a spear. Ripley would be proud.
Scar obviously thought so, too, marking her as kin with Xenomorph blood.
Weyland wielding a home-made flamethrower.
Weyland: Don't you turn your back on me! (fires at Scar).
It bears mentioning that Scar has passed Weyland, had determined that he was too old and frail to be a suitable trophy. Weyland probably knew it wasn't going to end well for him, but his makeshift flamethrower earned Scar's respect, even if it did get him skewered for his trouble.
Lex and Scar working together to fight the Xenomorphs. Never has a team-up looked so awesome.
Lex watches Rousseau loading her pistol.
Lex: Seven seasons on the ice, and I've never seen a gun save someone's life. Rousseau: I don't plan on using it. Lex: Then why bring it? Rousseau: Same principle as a condom. I'd rather have one and not need it, then need it and not have one.
Lex impaling one of the aliens to death as it tries to get her. It was so awesome that it impressed the Predator enough to allow her to accompany him.
When Scar demonstrates exactly what his self-destruct device will do to the nest.
Lex: It's a bomb... I hope it kills every fucking one of 'em!
Later on, we get to see it do just that. Probably the first time one of those had ever been used for a constructive purpose.
In the first movie, right before the first Predator stabs Lex, a tail impales him from behind. Epic music builds up, the Predator is pulled upwards until he's facing a dark tunnel on the wall, and slowly, an Alien (Grid) appears. She leans forward until she's face-to-face with the Predator, and hisssssssses. Also, the first time an Alien and Predator come face-to-face on film.
When Scar finally gets hold of his plasma caster after having killed an alien without it. Most of the hive are coming towards him and he just stands there opening fire with the caster, reminding you how deadly a Predator can be. Doubles as a moment for Grid as she dodges the first shot.
Scar saving Lex from the Queen. He jumps, pulls some fancy acrobatic ninja-esque spin in mid-air, and rams his spear through the Queen's head. Say what you will about the first AVP but that was absolutely badass. See here◊
And when the Queen has him mortally injured, cornered and pinned down, she comes down face-to-face to him and hisses in his face. Scar roars in reply.
Scar gets one earlier in the movie. A facehugger takes a lunge at him and Scar takes him out in midair with a shuriken. Then an alien quietly slides in from above, and Scar slices its face off (and its brain in half) without even looking. If he hadn't been so full of himself he might have avoided getting grabbed by the second facehugger.
The elder giving his combistick to Lexi. While humans have been acknowledged by Predators in the past and given gifts, this is something completely different. This is the elder of a clan acknowledging her not as a worthy warrior of another species, but as a Blooded Yautja in her own right. Essentially, Lexi is one of the only non-Yautja to be considered a full member of one of their clans.
Video Game
The 1999 game had a unique mechanic in that each race could shout/roar/hiss, and this affected the morale of the (mook) opponents. With Marines tending to move in groups, a concerted terror campaign by a hidden alien/predator could cause the marines to begin panic-firing. This was especially effective if the marines were carrying flamethrowers or missile launchers. Skilled hit-and-fade alien players or sniping predators could produce the same effects.
In AvP: Evolution, during the Predator Missions, you can encounter Facehuggers which can and Will attach to your face. Game over right? Nothing can pull those things off once their on right? WRONG! If you swipe down when instructed, your Predator will Rip the Facehugger off, slam it into the ground, and Curb-Stomp it! Badass.
Near the end of the Marine campaign in AvP2 Frosty puts on Alice, a heavily armed and armored military version of the power loader and heads into a Xenomorph hive to rescue his own team after they were lured into a trap. Taking on xenomorphs in Power Armor is really damn satisfying.
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