My fav creatures of the show qUq!!!These are of course not canon and are only my interpretation to these creatures.
 
Breezies: The tiniest creature in Equestria, but their character makes up for their height. They are EXTREMELY emotional, maybe it is because their body it’s so small that they can handle only one emotion at a time, when they get mad they turn red,when they are sad blue, etc. They have fluff on their neck and legs to collect pollen and protect them from the cold. Their antennas work as a long distance communication system, they can feel other breezies emotion through them. They leave a “Breezie Ring” when they pass through Ponyville, it is said that if you find one it will bring you good luck till the breezies return.
 
Kirins/Nirinks: These creatures represent the perfect balance of creation and destruction, they are extremely skilled when it comes to the arts, but they are horrible when they destroy what they create. The eldest Kirin acts as a leader in they village. The Kirins are omnivorous, they have pointy teeth and usually eat fish and vegetables that they grow on their homes. They lived at the top of the Peaks of Peril, very close to Mistmane’s Village. I will say that Autumn Blaze is one of my favourite characters in Mlp! Like, my girl referenced Hamilton, The phantom of the opera and…Evita?? I think, in the same song, how can my musical theater heart not love her?!
 
Deer: A long time ago, there was a terrible fire in the Everfree Forest, when the fire ended, it is said that the forest cried, and from those tears the deer were born. The deers are the protectors of nature, they feel everything that happens in the forest, they venerate their home. They can actually grow plants from their hooves, but they can also use potions to grow plants, they are given to young fawns so they learn to control it. Their king, Aspen may look intimidating, but he has a heart of gold, he treats his subjects with kindness, here he is with her queen Cerise, and their son, prince Bramble. Deers are fairly common outside of the Everfree forest, and hybrids between them and ponies can be seen in a lot of places, usually these hybrids have a connection of some way with nature (since i headcanon that Fluttershy’s dad is half deer, that is the reason that she can communicate with animals)
 
Reindeer: The common reindeer can manipulate snow and ice at will, they live very far away in their own village. They perform magic with their horns, which are covered with frost. They are very proud creatures. The gift givers of the grove, they are actually different parts of the same person, once upon a time, after the first HeartWarming Eve, a reindeer called Northern Lights appeared, she gave gifts of all kind to everypony, it seemed as she knew exactly what everyone wanted, but she wasn’t inmortal, when she died many HeartWarming Eves later, the ponies mourned her, and were surprised to find a gift from her the other morning, and the other years. It turned out that her spirit and her heart was so pure, that it broke in three other souls, Aurora, Bori and Alice. Btw can you guess who is the Reindeer on the right? ;)