Usagi-Zakura
An Artist Who Rocks - 100+ images under their artist tag
Artist -

Queen of the Cyberponies
@Scrounge  
Well it IS the same concept only why would the evil version of the Princess of Day be named Nightmare Star?  
Both of those concepts are associated with night-time. (and yes I know the sun is technically a star but still. Nightmare still doesn’t make sense.)
Scrounge
My Little Pony - 1992 Edition
Wallet After Summer Sale -
Not a Llama - Happy April Fools Day!
Since the Beginning  -

nobody's favorite
I thought Daybreaker was Nightmare Star and it was basically the same thing as Mane Goodall being renamed Dr. Fauna.
Officer Hotpants
My Little Pony - 1992 Edition
Friendship, Art, and Magic (2020) -
Wallet After Summer Sale -
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends.
Equality - In our state, we do not stand out.

Literally3HitlersInACoat
I actually like Daybreaker better, name included.
infinita est lux Solis
Artist -

Heretical Inquisitor
@Prof.NightJack  
CHAOS!  
full
Prof.NightJack
Equality - In our state, we do not stand out.
The End wasn't The End - Found a new home after the great exodus of 2012

Gizmonics Scientist
@infinita est lux Solis  
Well this is it everyone, time to go chaos. :p
infinita est lux Solis
Artist -

Heretical Inquisitor
@Prof.NightJack  
But everything changed when the fire pony attacked!
Usagi-Zakura
An Artist Who Rocks - 100+ images under their artist tag
Artist -

Queen of the Cyberponies
@CoriumQuest  
I like that idea.
Prof.NightJack
Equality - In our state, we do not stand out.
The End wasn't The End - Found a new home after the great exodus of 2012

Gizmonics Scientist
@CoriumQuest  
“BURN EVERYTHING, SCORCH THE GROUND!” kind of thing, right?
CoriumQuest

I love the name Daybreaker, its unique instead of having to copy the whole “Nightmare” part of Luna. Also, 100% head canon that Daybreaker came into existence in the barren wasteland future that Starlight and Twilight saw :P
SeanTaylor21

@dynamicv  
Nope. Daybreaker is her real name. Get over it.
infinita est lux Solis
Artist -

Heretical Inquisitor
@maverick159  
i doubt a bucket of water would be adaquate to kill her, and i had to pause and listen to ““this[](https://www.youtube.com/watch?v=_FdnA4SyYzE) over and over again when i first saw her…
Necrikus

Daybreaker has the better looks and name.
maverick159
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends.

Y'all are stupid!
@infinita est lux Solis  
Then all they needed was a water bucket and she was gone
 
Also, Solar Flare looks more like an OC name
infinita est lux Solis
Artist -

Heretical Inquisitor
@maverick159  
possibly…?
maverick159
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends.

Y'all are stupid!
@infinita est lux Solis  
Now i wonder, if her fire was gone, would she die just like charmander?
infinita est lux Solis
Artist -

Heretical Inquisitor
@maverick159  
well there are some versions of solar flare that i think look better, but yes daybreaker does look better then this version of solar flare
maverick159
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends.

Y'all are stupid!
Daybreaker looks way more badass
Background Pony #1065
I like the name Nightmare Star more than Daybreaker. I figured they were both, more or less supposed to be the same character.
infinita est lux Solis
Artist -

Heretical Inquisitor
Prof.NightJack
Equality - In our state, we do not stand out.
The End wasn't The End - Found a new home after the great exodus of 2012

Gizmonics Scientist
@infinita est lux Solis  
Only technically.  
Like how Nightmare Moon and Luna are technically the same.
infinita est lux Solis
Artist -

Heretical Inquisitor
aren’t they the same pony?
Background Pony Number 17
My Little Pony - 1992 Edition

“Daybreaker” sounds like the name of a heavy metal album, so it wins hands-down.
krokster7

I knew this is bound to happen, but the crew uses Daybreaker as the name when I still prefer Solar Flare. It’s kind of interesting when the dark side of Celestia pops up.
sw_french-pony

Daybreaker wins, but Nightmare Star is so fashion that she’s surely the solar form of Nightmare Rarity.
Usagi-Zakura
An Artist Who Rocks - 100+ images under their artist tag
Artist -

Queen of the Cyberponies
There’s no point in “arguing” about which one is best.  
Daybreaker is the closest we’ll probably ever get to an evil Celestia, and if someone complains this breaks their “headcanon” then I’m out XD
 
ButDaybreakerisstillthebettername.