Pinkie Pie is just anordinary baker living in Ponyville, she's cheerful, kind, and she's got some odd collection of friends with her. Including Applejack and Rainbow Dash.
Pinkie often visits canterlot to see Rainbow Dash or to bake something for the Princesses.
But be careful, she maybe cheerful and kind, but behind that smile is something you wouldn't want to see.
Ponies try their best not to make her mad because she's got that fuse ready to blow at any time.
Say something salty to her, and instead of receiving sugar prepare for a huge black eye.