This is Papillon, a Posh Pony unicorn. As you can see she has butterfly wings like many others of her kind.  
Posh Ponies are the remnant inhabitants of a great and powerful civilization that once ruled the butterfly archipelago “Butterfly Island.”
 
Papillon “though a typical unicorn of her kind” is a common sense sort of pony with a good head on her shoulders, others often look to her for guidance and advice. She’s a quick learner and let’s the lessons of the past guide her often times. This is in some ways a bad thing as the history of their islands has made her secretive, apprehensive of change, and deeply suspicious of outsiders, one possible reason as to why the Butterfly Archipelago remains lost to the outside world in recent times.