Meet Murky Waters :3
 
She is a Swamp Pony :3
 
She is a sub-species of plant ponies, who has been given the task of protecting the swamps of Equestria…  
And she;s not happy about it X)  
All the other planet ponies get to live in nice gardens and be parts of things like roses or daisies. All Murky gets is mud, muck and swamp water :P
 
Because of this, she can be a pretty grumpy and cynical mare, but she still does her best to protect the swamp. She is not fond of most visitors (since a lot of them like to make fun of her for being stuck there), but she does like it when ponies actually treat her nicely and with respect. It makes her feel nice.
 
Despite her grumpy nature she can be a good hearted pony when she wants to be, especially towards ones who are nice to her. She is able to control of the plant life around the swamp, being able to merge and control the water and trees there. She also is a good cook, making foods based of the mushrooms, sea creatures and flowers found in the swamps. Also speaks with a Cajun accent.
 
Also obligatory Shrek clip :P