This is winter. She’s a Pegasus that DJ’s around the New Pegas area.  
As the last image was posted with Critical Hit, this is her special somepony.  
In the Roleplay game, Critical and Winter are in which are crucial for the setting, and for Critical himself in which he has never dated anypony outside the Stable, Stable 32.  
Sometimes Critical’s friend List and Curtain visit Winter for some relationship problems but it mostly ends out in which List and Curtain get to sing a song live on the air and List always get embarrassed at the end.  
But in all, she is overall a nice pony and does have a neat background once you get to know her more.