Still none (yet) from the IDW comics.
 
Pegasi, unicorns and alicorns (and Homo sapiens sapiens) are self-explanatory.
 
 
For the next monsters or creatures for future episodes, please answer in the comments.

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Background Pony #BCFC
#JusticeforAll
Uchiwa SusGay 𖣐
Different Timelines, Same Faces - Celebrated the 15th anniversary of MLP:FiM!
Friendship Games 10th Anniversary - Celebrated the 10th anniversary of EQG Friendship Games!
Nightmare in the Moon - Had their OC in the 2024 Derpibooru Collab.
An Artist Who Rocks - 100+ images under their artist tag
Pixel Perfection - I still call her Lightning Bolt
Silly Pony - Celebrated the 13th anniversary of MLP:FIM, and 40 years of MLP!
Shimmering Smile - Celebrated the 10th anniversary of Equestria Girls!
Speaking Fancy - Badge given to  that help with translations
Cool Crow - "Caw!" An awesome tagger
Lunar Guardian - Earned a place among the ranks of the most loyal New Lunar Republic soldiers (April Fools 2023).

TWIBOORU SUCKS!!
How about adding some youkai? (Japanese myth monsters)
Let Badumsquish make it real
Uchiwa SusGay 𖣐
Different Timelines, Same Faces - Celebrated the 15th anniversary of MLP:FiM!
Friendship Games 10th Anniversary - Celebrated the 10th anniversary of EQG Friendship Games!
Nightmare in the Moon - Had their OC in the 2024 Derpibooru Collab.
An Artist Who Rocks - 100+ images under their artist tag
Pixel Perfection - I still call her Lightning Bolt
Silly Pony - Celebrated the 13th anniversary of MLP:FIM, and 40 years of MLP!
Shimmering Smile - Celebrated the 10th anniversary of Equestria Girls!
Speaking Fancy - Badge given to  that help with translations
Cool Crow - "Caw!" An awesome tagger
Lunar Guardian - Earned a place among the ranks of the most loyal New Lunar Republic soldiers (April Fools 2023).

TWIBOORU SUCKS!!
I assume everyone is all ready aware that FiM is set in a world that parodies Ancient Greek Mythology, right? Authority figures even raise and lower the sun and moon like the Greek Gods did, and their servants control the local weather, also like in Greek Myth.
 
Voting Typhon for FiM Final Boss.
Don’t forget Chinese (kirin) and Egypt (Sphinx)
Background Pony #427A
Mythological beings
Background Pony #61F0
I wished the show staff had shown even more beings from myths and legends…
Discord should have been on here. And he should have been Q. Heuh ehuh.
Evil Emperor Proteus

Master of Science
I assume everyone is all ready aware that FiM is set in a world that parodies Ancient Greek Mythology, right? Authority figures even raise and lower the sun and moon like the Greek Gods did, and their servants control the local weather, also like in Greek Myth.
 
Voting Typhon for FiM Final Boss.
Scrounge
My Little Pony - 1992 Edition
Wallet After Summer Sale -
Not a Llama - Happy April Fools Day!
Since the Beginning  -

nobody's favorite
This might fit.
What’s next?
Ponynstuff320 (Toon-n-crossover
An Artist Who Rocks - 100+ images under their artist tag
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I'm a shitty artist
@Ponynstuff320 (Toon-n-crossover  
I know zebras like Zecora are not a creature, but there might be a big handful of mythical creatures that could be part of her African-esque country.
Ponynstuff320 (Toon-n-crossover
An Artist Who Rocks - 100+ images under their artist tag
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I'm a shitty artist
@Scrounge  
Hell, we have creatures in not only in the show, but in the comics of the myths that are part on their cultural habitat.
 
Zeroes (Africa)
 
Ahuizotl (Mexico)
 
Sphinx (Egypt) though, we have Anubis and Baast/Bastest who were in the comics. The Sphinx was cameoed in Castle Sweet Castle.
Ponynstuff320 (Toon-n-crossover
An Artist Who Rocks - 100+ images under their artist tag
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@Scrounge  
And the entire fox clan are ninjas.
Ponynstuff320 (Toon-n-crossover
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I'm a shitty artist
@Scrounge  
i believe a handful of mythical eastern creatures are a good fit in this universe. I have an idea that kitsune would be an empress of a 1-3 tail vulpine clan which are basically an eastern version of a Diamond Dog clan. Since dogs and foxes are canines.
Scrounge
My Little Pony - 1992 Edition
Wallet After Summer Sale -
Not a Llama - Happy April Fools Day!
Since the Beginning  -

nobody's favorite
@Ponynstuff320 (Toon-n-crossover  
If things from all over the world are fair game, how about kappas?
Ponynstuff320 (Toon-n-crossover
An Artist Who Rocks - 100+ images under their artist tag
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I'm a shitty artist
@Scrounge  
It’ll be cool if Charybdis is in the show, or a Kracken. (Squirk from G1) Also, here’s an aztec creature that is extremely obsucre. And the fanmade version. Speaking about aztec creatures, Cipactli; has been mentioned in Daring Do and the Marked Thief of Marapore.
Scrounge
My Little Pony - 1992 Edition
Wallet After Summer Sale -
Not a Llama - Happy April Fools Day!
Since the Beginning  -

nobody's favorite
@Ponynstuff320 (Toon-n-crossover  
They’d have to change it a little, because how often are axes, unattended or otherwise, a thing on FiM? :)
Ponynstuff320 (Toon-n-crossover
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@Scrounge  
The Axehandle Hound too.
Scrounge
My Little Pony - 1992 Edition
Wallet After Summer Sale -
Not a Llama - Happy April Fools Day!
Since the Beginning  -

nobody's favorite
This one’s a bit obscure, but I think splintercats would fit in well with Equestria’s weird wildlife.
HyaenusDominae

vacant expression
I want a kraken and/or leviathan.  
Also, ancient order of pegasus warriors called Valkyries.
I want to see a gryphon and pony walking along with a young hippogriff in tow.
Background Pony #1668
Ooh, what about a Dullahan for the headless horse?
Lord WyrmSpawN
Solar er - Fought against the New Lunar Republic rebellion on the side of the Solar Deity (April Fools 2023).
Non-Fungible Trixie -
Thread Starter - MLP G5 Discussion and Speculation Thread
My Little Pony - 1992 Edition
Wallet After Summer Sale -
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends.
Friendship, Art, and Magic (2018) - Celebrated Derpibooru's six year anniversary with friends.
Not a Llama - Happy April Fools Day!
Friendship, Art, and Magic (2017) - Celebrated Derpibooru's five year anniversary with friends.
The End wasn't The End - Found a new home after the great exodus of 2012

Put Out to Pasture
My current wish is for a nuckelavee.
How about adding some youkai? (Japanese myth monsters)
Ponynstuff320 (Toon-n-crossover
An Artist Who Rocks - 100+ images under their artist tag
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How about the ones from the comics?
The ‘demon’ should be changed to moody Sunset Shimmer.