Amethyst Star

Amethyst Star is the name of a background pony. She is a unicorn pony with a lavender pink coat, a violet mane and tail with a floral lavender streak, amethyst eyes, and a cutie mark of three brilliant-cut diamonds. Her name is not mentioned on the show, but it appears on the pamphlet of a surprise bag toy released in November 2011. She had a speaking role in The Mysterious Mare Do Well.

Depiction in the series
Amethyst Star is commonly featured in the series as a background pony. Her appearance changes sometimes; when appearing at parties or more formal occasions, she usually wears a yellow-orange saddle with a yellow skirt underneath as well as a yellow flower in her mane.

She first appeared as a passerby in Canterlot in Friendship is Magic, part 1, holding a shopping bag in her mouth while Twilight Sparkle ran past her. She next appeared in the party that Pinkie Pie threw for Twilight in the library at Ponyville, and has since remained a consistent sight in the town.

In the episode Winter Wrap Up, she was the leader of the animal team, but she was also seen as part of the weather team during the ice-carving scene. She participates in the Running of the Leaves in Fall Weather Friends, but her number is obscured.

In Over a Barrel, she is a resident of Appleloosa, wearing the same yellow-orange saddle along with a straw-colored, dome-crowned cowpony hat.

She attends the Grand Galloping Gala in The Best Night Ever. While marching on her way to the gala, she appears hornless in one instance, which earned her the name "Sunset Bliss" from fans on the assumption that she is a different pony.

She competes in Sisterhooves Social alongside "Dinky Doo".

She is seen with "Tootsie Flute" in The Mysterious Mare Do Well at a picnic. Rainbow Dash attempts to open her jar of peanut butter in an attempt at heroism, whereupon Amethyst Star responds with her first spoken lines.

Appearances
Times stated below are approximate and taken from videos available online.

Merchandise
A glitter surprise bag toy named Amethyst Star was released in November 2011. The toy closely resembles the character in body color, eye color, and cutie mark. Her name comes from the card accompanying the toy.

Quotes

 * Rainbow Dash: You'd better let me handle this, ma'am! For your own safety, I must ask you to stand back!
 * Amethyst Star: Oh brother.
 * Rainbow Dash: Ta-dah!
 * Amethyst Star: Uh... thanks.
 * Rainbow Dash: How would you describe what I just did? Would you say I was amazing?
 * Amethyst Star: Aren't you milking this a bit?
 * Rainbow Dash: Please, just answer the question! Was I, or was I not, amazing?
 * Amethyst Star: Oh, you're amazing all right. And amazingly--
 * Rainbow Dash: Oh, look!

--The Mysterious Mare Do Well

Trivia

 * Before the toy was released in November 2011, Amethyst Star was called "Sparkler" by fans. Incidentally, "Sparkler" was the name first proposed by Lauren Faust for the unicorn Rarity, but had to be dropped because Hasbro had lost the rights to the name.