UPDATE: Cozy Glow would be Pride!

@Background Pony #7A06  
Indeed, I think pre-redemption Diamond Tiara would be a much better fit.

What the heck is little Woona doing there? She hasn’t appeared in the show, but I doubt her real personality would be “Pride the arrogant”. It seems like a huge stretch. So, why is she among them?I’ve never seen Fullmetal Alchemist, but I have no idea if watching it would clear anything up.

Switch Gilda and Sombra around and that’s actually fucking perfect.
 
I mean Sombra was practically BRED for Wrath.

@Dirty Bit
 
Twilight: Shining Armor is dead. That is a fact. You invoke his image? You must be a glutton for punishment!

@Dirty Bit
 
Rover: Come on, we’ve got to get to the interior. (stopped by an enlarging hoof)
 
Chrysalis: Oh, I’m not through with you yet. You see, we have some unfinished business after the incident in… (face explodes)
 
Twilight: (burning hair) Keep your eyes on me, Chrysalis. Our conversation is the only one that matters right now!

@Background Pony #28CC  
I agree, though this was made before “Rainbow Rocks”.

@Tythen  
I think Adagio Dazzle could be a good fit for Lust, since she’s a Siren and all.

@Background Pony #B690
 
Twilight: That’s enough…You were stupid enough to confess, and even more stupid to boast…Everything you said is fuel on your funeral pyre! So then, I think I’ll begin…
 
horn lights up as a look of sheer rage and vengeance was seen on her face
 
Twilight: …by burning your tongue!

Twilight: You’re saying you killed my brother? I doubt a moron like you could pull that off.  
Chrysalis: HA! Moron? (turns into Cadence) TELL ME WHO THE REAL MORON IS, BECAUSE I DON’T THINK IT’S ME! I prefer to use that term for people who fall for a cheap trick like this!  
Twilight: D8  
Chrysalis: HAHA! You should see your face! You’re not gonna believe this, but that was the same look on Shining Armor’s face when I hexed him! The utter shock, the dumb confusion! You could see every emotion as his own wife hurled a killing jinx at him! Ahhh…it…was…GREAT!!!! >:D

@Background Pony #FCA9  
I actually find it to be the opposite. While yes, the Queen can change forms, Sunset is the only one to actually “change” completely.

I agree with everyone who says Sombra should be Wrath. Not only it fits his criteria. It also makes me think Sombra as a powerful swordsman.

Switch Sombra and Gilda and you have me sold.
 
Although, I’m slightly wanting Sunset to be Envy because tears (If those of you know what I’m referring to…)

Trixie must be Pride

Chrysalis is Envy, huh? Why do I find that fitting?

Celestia should be lust. Just for VA jokes

Sombra should be Wrath, not Greed.

@Background Pony  
Well chrysalis changes shape and apearance which is what envy dose in FMA.

so, wait. wouldn’t that mean King Sombra become a good guy later after possessing someone? Cool! :D

What redundant names.

Wrong. Chrysalis is the one who feeds from love itself, effectively labeling her as Lust.
 
Sunset steals a crown of unbridled power, seeking the power to surpass her former teacher. She is Envy.
 
Discord was defeated by assuming that he was more powerful than the power of friendship. Seems like a very Prideful thing to me.
 
King Sombra enslaved his own subjects and held them in chains as they lived. After his first defeat, he seeks to renew his position as an overlord of the north. That is Wrath in action.
 
The parasprites devour many things in their path, even objects made of non-edible ingredients (after a bad spell). Collectively, they represent Gluttony.
 
Spike, despite his good deeds, will have ulterior motives to many of the things that he does, whether it is jewels or even a water tower. His growth increases with his Greed.
 
Diamond Dogs live underground in search of precious minerals, leaving them to live in a perpetual state of filth. They won’t move unless there is something shiny in the distance. Collectively, they represent the spirit of Sloth.

YES!