Countess Pi

 is a kindness unicorn. She was played by Julie Nathanson.

Appearance
Countess Pi is a unicorn with greenish white coat, a purple mane and green eyes. Her cutie mark is a blue and purple Pi symbol. She wears large round glasses and a golden crown.

Personality
Countess Pi is rather magical and kind. She has many special talents related to numbers and circles.

Trivia

 * Julie loosely dressed up as her character for this episode. She wore a headband with unicorn ears and a horn, and purple highlights in her hair.