@Digital Seapony  

 
Maybe it’s “name every main character”?  
Also, you make a good point.

Twinkle Sprinkle.

 
No!

@Digital Seapony  
Here’s what it might look like:  
https://pastebin.com/9ruSfinu

There’s a total of 3632 character tags on Derpibooru^[1][2]^{. Assuming a rate of 50 characters per minute}[3]^, it would take about 1 hour and 12 minutes to say them all.
 
_{[1] The actual number of characters is probably slightly less than that, since some of those tags imply each other (vinyl scratch and dj pon-3, doctor whooves and time turner etc.).
 
[2] Then again, it might be more than that if you count the EqG equivalents of MLP:FiM characters as separate characters.
 
[3] The average rate of speech is estimated to be about 125-150 words per minute, but an average MLP character name has more syllables than an average word (see: Twilight Sparkle, Masked Matter-horn, etc.).}

[‘Paralyzer’ Intensifies]

Twilight Sparkle, Fluttershy, Applejack, Pinky Pinks, Posh White, Gay Hair, Minty Fresh, Strange Magic, Mister Ed, Applejack, Karl Marx and The American Dental Association.

Oh, this is so much pressure…ummmmm… Th-The nerd one, the southern one, the white one, the ADHD one, the gay-colored one and Fluttershy. That good? Oh I forgot…..the dragon slave, The sun horse, the overrated moon horse, love god horse, those three frickin kids (Apl bom, swooty bill, scot) um ummmm….those 6 other kids…shiny armer….ACK-so much PRESSURE! Umm.. wait wait um….Sterlight Glummer, Trix are for kids, The ADHD one’s sisters (Mod, Limstin, Merbls)…um um frick…sunshit shambler, tempst….um um oOH uh the sirens (yellow, purple and cyan) uhhh Derpy one oh yeah that’s the ticket! Ummmmmm…Those pillars of Hermany (Starswish the beard, Rocklimb, Flish Magoo, Mintsstmane, Somurinuianuirnbeoa, and Mange Merdlebrank) and the Queen Chripplemouse of the Chergelings an the Trek that centaur and the Cooty Glue that insane child
 
(heart gives out)
 
I forgot the…I feel lil bit woozy..dies

@Background Pony #7D72  
No that’s not all of them there’s more

@Background Pony #7D72  
Mistmane

What’s funny is that this meme usually implies the “name every” is impossible….but this one is absolutely doable.

@Background Pony #7D72  
Rainbow Dash

-Trixie  
-Side characters  
-Background Ponies
 
So thats all

Applejackie Cha-GODDAMMIT.

…Including all from other generations.
 
(I can’t, because I haven’t watched much G1)
 
I wonder if anyone can also name every single individual fan-made OC that was made as of this image…

EZ
 
twilight sparkle  
apple jack  
rarity  
pinke pie  
Fluttershy  
Trixie  
Starlight glammar  
Charlie  
Princess luna  
Big mac  
Trapeze star  
mayor mare  
bon bon  
mrs and ms cake  
Derpy hooves  
apple bloom  
Sweetie belle  
scoots  
dj pon-3  
Princess Celestia  
twist  
Diamond tiara  
Silver spoon  
Doctor whooves  
cozy glow  
Darling do  
Potion Nova  
spa ponies  
The Wonderbots  
the villains etc.  
Spoiled rich  
Fancy pants  
Sunshine glammar  
wild fire  
Unknown and background ponies  
Tempest shadow  
Angel bunny  
Pinkie pie family  
Flattery heart  
Pound cake  
Pumpkin cake  
Moondancer  
rara  
flffle Puff  
The Apple family  
rose luck  
Cheese sandwich  
spike  
Nurse red heart  
Nurse sweetheart  
Nursery rhyme
 

 
 
I think that’s all of them
 
 
edit: are you sure about that?

Challenge accepted.