This is giving me Full Metal Alchemist Conquerer of Shamballa vibes.
Sunset could have been the Dietlinde Eckhart of MLP had she made it through the portal.

@chazkopa
Don’t you mean a brainwashed/zombified demon army? Turn her brainwashed victims into mindless raging demonic beasts?! That’s what she should have done?!

[Plottwist]: By “disintegrating” Princess Twilight & the “Humane Five” with extreme magic, she triggered the same effect that made Twilight an alicorn in Equestria.  
They “respawn” in the same place after a few hours, ALL of them now with wings and “energy horns” (like “Midnight Sparkle” & “Daydream Shimmer” in the “Friendship Games” movie), ready to go back to Equestria…

Rip Mane 6
 
Demon Queen Girl
 
Demon Javier Garcia
 
Demon Familys And Friendship

Nice. It would be cool for Sunset’s demon army, if she had won.
 
And Flash Sentry give Rainbow Dash a fright.

Suddenly Doom Slayer appears out of nowhere!

And then Dash proceeds to beat the crap out of Sunset and her goons in 10 seconds flat!

So, what was that about faith again Celestia?

@Dulset  
She wanted to understand all the magic of Equestria, which most likely means taking all of it.

oh no, it’s sunset shimmer, and her army of demonic foals!
 
I cannot say that with a straight face.

Skip to Panel 15
 
Daemon Sunset: “Go my minions! Go! Into the portal and to Equestria!”
 
Hordes of the newly transformed teenage daemons charged with haste to the Equestria portal. Young men and women who were once human now slaves to sunset’s bidding, a shadow of their former selves. Wherever Sunset did to their very being and mind has made them into unreasonable, irrational creatures that live to serve Sunset’s goal, to destroy Celestia and take over Equestria as their new queen. As the her army ran towards the portal a strange light started to appear. The blue light appeared in front of the gateway to Equestria, no bigger than a size of a basketball but quickly grew in mass into a gigantic hole bigger than it was once in mere seconds, blocking the Equestria portal. The emergence of this new portal blew a heavy gust of wind, sending bits of dust and debris towards their general direction. Sunset now frustrated and angry that this sudden new development is blocking her only entrance to her homeworld, but instead just feeling these based emotions she not only felt some sort of ominous and menacing object within that new portal. But felt whatever is in that portal was coming for her. Did Twilight warn Celestia about her incoming attack? No, she couldn’t, she’s dead and along of with the rest of their damnable friends. So what could it be?
 
As she and her army of high school daemons stood still. Whispers of unknown origin started chanting very alien but thunderous words.
 
Kar En Tuk
 
Kar En Tuk
 
Kar En Tuk
 
Kar En Tuk
 

 
Her assumptions were fearfully confirmed, as a being emerged from the new portal. This being no. This creature. Was as tall as he was intimidating. A man who appeared to be around 6ft tall, covered in green and grey armour for exception of biceps with some sort of retractable blade on his left arm, on his back was a strange weapon, sort of like a mini guided cannon that looked to be stationary but ready to fire at his will, his helmet was also same colour as his body armour but had a strange symbol on the right side. Sunset could almost get a look of what the man look like but couldn’t because the tinted glass masking his true identity. The man look around in his surroundings, examining Sunset and her army
 
Daemon Sunset: You! Explain your unannounced intrusion!
 
The man stood silently
 
Daemon Sunset: Have you come to stop me? All by yourself? Hahahahahahahaha! You think that YOU could defeat me and my entire army? What a foolish endeavor! Let me guess, this is Celestia’s desperate attempt to stop me from entering Equestria? To send some man against a entire army? No matter. I suggest you leave this world or suffer the wrath of me and my army!
 
The man takes out a loaded combat shotgun from what seems to be out of nowhere, grabbing it with both arms on its grip and forearm
 
Cocks Shotgun
 
Daemon Sunset: “If that’s what you have chosen so be it! You are but one man! Dispose of him minions!
 
Sunset’s daemon army charges head on towards the man. Their new plans to destroy him and resume their original plan to enter Equestria. Most running with upmost speed and agility while other flew with their newly acquired daemon like wings. As they ran towards him, he lifted his shotgun towards to the young daemons and charged
 
Cues Music  
https://www.youtube.com/watch?v=Fw21lF9chYE&t=4s

@Seif  

 
The Dazzlings could have won by just walking through the open portal at any time and then breaking it from the other side while Twilight was still there ;)
 
Midnight though… did she even have goals?

I would love to see what would happen if The Dazzlings or Midnight Sparkle won