Pinkie Pie

You two were siblings. She was the more energetic type while you were the calm and peaceful type. Often, you were annoyed by her antics, but it was tolerable. Until one day, She did something that you could not forgive..

As you were walking the through Ponyville until Pinkie suddenly shot a confetti cannon in your face. You stopped in your tracks, and everypony laughed, even the Main 6.