Parallel Black
Solar Supporter - Fought against the New Lunar Republic rebellion on the side of the Solar Deity (April Fools 2023).
Princess of Love - Extra special version for those who participated in the Canterlot Wedding 10th anniversary event by contributing art.
Non-Fungible Trixie -
A Really Classy Artist - 250+ images under their artist tag
Twinkling Balloon - Took part in the 2021 community collab.
Friendship, Art, and Magic (2020) - Took part in the 2020 Community Collab
Dream Come True! - Participated in the MLP 9th Anniversary Event
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends.
Not a Llama - Happy April Fools Day!
Friendly Griffon - For helping others attend the fifth anniversary party

Really? “Equal Four” is what we settled with in the end? Guys, we had “Friendtastic Four” and the “Free Town Four” to choose from, and we went with something basic and possibly unsuited instead? As someone else said in the comment thread here, equality was a negative concept in the premier, so why would it make sense to call these guys after it?
misiek200m

Equal Four… Me gusta! My first idea was OC4, but this one is better. :)
Poptard
Every pony has fans - Derpi Supporter
Silver Bit -
Diamond -
Wallet After Summer Sale -
Not a Llama - Happy April Fools Day!
Happy Derpy! -
Silver Supporter -
The End wasn't The End - Found a new home after the great exodus of 2012

The Tastiest
@Yet_One_More_Idiot  
Nah, we already have those.
Yet One More Idiot
Artist -

World's biggest idiot xD
@Poptard  
The Four Ponies of the Aponylypse? :P
Poptard
Every pony has fans - Derpi Supporter
Silver Bit -
Diamond -
Wallet After Summer Sale -
Not a Llama - Happy April Fools Day!
Happy Derpy! -
Silver Supporter -
The End wasn't The End - Found a new home after the great exodus of 2012

The Tastiest
@621Chopsuey  
Maybe the Village Ponies.
621Chopsuey

Kotone Shiomi fanboy
@Yet_One_More_Idiot  
Cutie Finders is popping up, too. Maybe merge that and Equal Four and have something like… The Cutie Four.
 
Huh, that actually has more than one connotation.
Yet One More Idiot
Artist -

World's biggest idiot xD
@Poptard  
The Four Amigos? The Famous Four? Friendship to the power of 4?
 
Lol these are terrible, I know. :P
Poptard
Every pony has fans - Derpi Supporter
Silver Bit -
Diamond -
Wallet After Summer Sale -
Not a Llama - Happy April Fools Day!
Happy Derpy! -
Silver Supporter -
The End wasn't The End - Found a new home after the great exodus of 2012

The Tastiest
Still prefer Friendtastic Four. Maybe because I came up with it.
Background Pony #62EA
I don’t really like “Equal Four,” because one of them, Double Diamond, was more-or-less Starlight Glimmer’s enforcer and the other three, Sugar Belle, Night Glider, and Party Favor, were dissenters in a sense. That doesn’t really come across as being so “equal” to me. Aside from that, after they got their cutie marks back, if the party is any indication, they seemed happy to all be different…
Background Pony #62EA
@Treforce  
Night Glider is the name of the other pony.
DuskShine-TheAltPony

@Treforce  
Still need one for Heart.
Treforce
Solar Supporter - Fought against the New Lunar Republic rebellion on the side of the Solar Deity (April Fools 2023).
Artist -

Party favor uses AIR to blow up ballons.  
Double Diamond is skiing on frozen WATER.  
Sugar belle most likely needs a FIRE to bake.
 
I’m not sure what the last ponies name or talent is, but I suspect a “Captain Planet” pony to appear in the show now.
MezzoDragon
The End wasn't The End - Found a new home after the great exodus of 2012

Pathetic Failure
@drumpowa  
Fair enough.
drumpowa

@MezzoDragon  
Actually if you add the Mane 6 and Equal 4 that makes an equal amount of pony races and 1 alicorn.
8bit22

Equal Four > Mane Six.
 
Deal with it.
SaintAbsol

Equal Four… I approve of this name.
wildrook
The End wasn't The End - Found a new home after the great exodus of 2012

The crazy part? One of them used to be the Dragon…this was THEIR episode, apparently.
Background Pony #F34B
I like dis
Hateot

@RIG  
I guess you could use “equine four” if you wanted to go for a horse pun, but “equal four” just rolls of the tongue much better if you ask me.
Yet One More Idiot
Artist -

World's biggest idiot xD
@DuskShine-TheAltPony  
Well that’s just a needlessly smart-aleck response. HAVE male alicorns been explicitly ruled out at any time by Word of God? If so, please provide links. Otherwise, please do not try to pass off your own opinions as fact. :)
MeshGearFox
The End wasn't The End - Found a new home after the great exodus of 2012

Alicorns are probably hermaphroditic.
 
It makes sense okay?
DuskShine-TheAltPony

@Yet_One_More_Idiot  
Yeah, you keep thinking that.
Yet One More Idiot
Artist -

World's biggest idiot xD
@MezzoDragon
Personally I wouldn’t like Sugar belle as an Alicorn and we all know males can’t be Alicorns.
 
Who says we all know that? Just because none have been shown thus far…it’s not been explicitly and canonically ruled out.
DuskShine-TheAltPony

@MezzoDragon  
Personally I wouldn’t like Sugar belle as an Alicorn and we all know males can’t be Alicorns.