headcanon - whenever the global headsplosion incident is mentioned, Eggsy's expression always shifts into a slight smile and he gets this vicious gleam in his eyes.

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headcanon - whenever the global headsplosion incident is mentioned, Eggsy's expression always shifts into a slight smile and he gets this vicious gleam in his eyes.
Eggsy’s murder-smile and manners-maketh-man-smile aren’t that different...
Mordred
Eggsy feels no hesitation, no remorse, nothing but a cold frozen fury when he leans back in his chair (Galahad’s chair, Harry’s chair) and watches, smiling faintly, as realisation breaks across Arthur’s face. He picks up the brandy glass again, sees it turn between his fingers, hears himself talk about the irony of Kingsman’s leader falling for a simple, common trick – and it’s like he’s an observer in his own body. It feels as though he’s listening to someone else’s voice, seeing through someone else’s eyes like how he saw through Harry’s glasses…
I’d rather be with Harry.
The ice shatters, and once again grief is burning through his veins. He surges forward, back into himself, with hands clenched together hard enough to bruise and the grim parody of a smile falling from his lips. Eggsy almost wants to bare his teeth and snarl at the man who had allied himself with Harry’s murderer, almost wants to let the traitor see the true face of this creature of vengeance he has surely become. But he doesn’t do any of it, because Harry wanted him to be a gentleman and he wants to live up to that, even when Harry’s gone and he’s still learning. Instead he fixes his gaze upon what is about to become his first kill, and suddenly thinks of how he couldn’t shoot the dog. I knew you couldn’t do it, Arthur said.
“I had that down already,” Eggsy says.
He finds himself oddly unsurprised when Chester King curses him in tones even coarser than his own (and oh, how the mighty have fallen), and does not flinch when the man drops dead before him, head thudding against the table as the poison completes its course.
I’ve had a lot of fun with this, he remembers Harry saying.
Eggsy can definitely see the appeal.
A life for a life, he thinks as he picks up the same pen that nearly cost him his life, and stabs (with just enough force, because he’s still trying to be a gentleman, still trying to learn) at the small neat scar in Arthur’s neck.
But Harry’s life is – was – worth so much more.
He barely notices the blood staining his fingertips as he pries open the incision and extracts the implant. He stares at it with mingled anger and disgust, before Arthur’s phone screen flashes purple with the V-Day notification – and it is at that moment that Eggsy knows, just knows without having to think any further, what he needs to do.
In Harry’s honour, Arthur told him only moments ago, I am inviting you to be part of a new world. Eggsy has never heard anything more ridiculous in his life. The only world he wants to be part of is one with Harry in it, but Valentine has taken that away from him.
He’ll just has to settle for second-best, then, won’t he? Nothing will ever be worth the price of Harry’s life, but the least Eggsy can do is to save the world and avenge his death.
Chester King was the first man Eggsy has ever killed, but he already knows that he will have much more blood on his hands before the day is over, and that Richmond Valentine will be the last.
The King is dead, long live the King.
The... shadows(?) below his eyes are especially visible in these shots. I think they’re meant to be a clear indication that Eggsy is doing a Death Glare.
Compare this:
The shadows are barely visible here, because he’s relaxed in Harry’s presence.
Even when they’re having their fight, the shadows are still not as pronounced as they are in the first set of pics:
Not much needs to be said about this one:
Eggsy’s look is significantly different after he dons the Kingsman suit and accessories. The Kingsman glasses almost completely obscure these shadows, making him look somewhat mellowed, but also make his face appear squarer.
The glasses end up serving the function of concealment - his anger and pain are less visible, but his dangerous side is also less apparent.
Headcanon: Eggsy is infinitely more dangerous when he’s truly angry. Fury doesn’t dull his thinking or hinder him in any way, instead he feels something like ice creeping into his veins and everything looks twice as clear as it normally does.
Imagine if Eggsy was sent on a rescue mission because Harry got captured and has already been hurt. Merlin doesn’t want him to know the full details of how bad it is, but Eggsy cuts over his reasoning with a simple, sharp, and perfectly enunciated “You know how I work under pressure.” He doesn’t raise or lower his voice and it doesn’t shake, but there’s something terrifying about how calm and almost conversational it is.
After the mission is completed (and a lot of people killed), Eggsy is sitting by Harry’s hospital bed and silently cataloguing all his cuts and bruises, breathing slowly as the ice slowly melts away and everything else comes back. His hands are numb and cold, and he wraps them around his neck to warm them up.