You know, looking back on this, it is kind of interesting how the idea of “Luna/Celestia having a long lost evil sibling that would serve as the main antagonist” was somewhat adopted with the introduction of Opaline in G5.

@voodoo91
Actually, Nightmare Moon’s real sister is Daybreaker and both Celestia and Luna don’t have an evil sibling. Nightmare Moon is actually an evil verison/split alternate personality/dark half/evil doppelgänger of Luna.

Wish they did introduce their brother

@Tambelon
 
@ADJLfanatic52
 
@voodoo91  
Well, the movie was originally going to feature Tempest Shadow as Celestia and Luna’s long lost brother Cosmos who is supposed to be the main antagonist of the film. But the film was changed, and Cosmos was taken out this movie. And his role was rewritten and replaced by the Storm King. And the Cosmos model was used as Tempest Shadow in the final film. So the makers would make sure that Celestia and Luna don’t have other siblings.

@ADJLfanatic52  
Discord is Celestia and Luna’s brother

@SpiderDragon  
Cosmos is being used in the comics, and isn’t a pony. Cosmos looks like a weird mix between Discord and Tempest, despite them trying to make him Celestia and Luna’s brother from like Season 1-7.

I actually hope they could use Cosmos in the future, only not as s villain but more in an anti-hero role, that and maybe a new physical appearance.

Cartaphilus!

That’s a lot of EDGE

looks rediclous like an bad oc lol. let stick a ton of cool thing on it.

@immblueversion  
Part of me wouldn’t mind so much , especially if it leads to backstory, but ultimately I’m glad they decided not to, because every idea I can think of for a villain sibling, at least in Celestias case, has already been done with nightmare moon.

Fallout Equestria wants its villain back.

@MLPfan9000  
Alpha from MIB.

@Ardashir  
That’s the least thing I want

I wonder if we’ll ever see a horn prosthetic in the show?

@Background Pony #AA99  
sounds like they were taking a leaf from Jurassic world’s book and thinking of using hybrids

That’s my pony!  

It looks a little overbusy. Tempest might not be quite as self consciously ‘cool’ looking, but she’s easier on the eye.

@Caelie  
It’d start the mother of all fan wars, but I would love to see something like that show up in the cartoon or comics. If only because then we’d get a little more backstory on Celestia and Luna.

@Background Pony #C7D2  
That’s another of the things the book mentioned: the artists took everything in the movie as far as they could take it, and then distilled it so it wouldn’t be too far out of place with the rest of the world the series crafted.

@Applepie1973  
Yeah, and apparently the book says the earliest concept for Cosmos was indeed Celestia’s brother. This is one of the later versions when they decided to make Cosmos a female, but still long before she became the Tempest we know now.

Omg! The leaks were real!

So that was Cosmos.

@Background Pony #AA99  
Indominus pony

@wolfnanaki  
That’s what I meant