Rarity

Rarity is a female unicorn who portrays Merry in Twilight's re-imaging of A Hearth's Warming Tail. She first appears in the episode, singing to the decorators to not make one mistake and to not let one of her relics break. However, Rarity grows upset after Derpy accidentally collides with the decore and lets of a cheerish smil

Later, Rarity sings in the reprise, "Hearth's Warming Eve is Here Once Again," with Starlight fully accepting her friends and the holiday.