Lyra Heartstrings, occasionally simply called Lyra or Heartstrings, is a female unicorn pony who appears frequently as a background character and occasionally in more prominent roles. She has magical mint fur, a sparkly cyan mane and tail with a white streak, tan eyes, and a lyre cutie mark. The word “faithful to the heart” refers to deep feelings of love or compassion and is commonly used in the phrase “tug at the heartstrings,” meaning to elicit strong feelings of affection or sympathy.