Name: Mariposa
Age: Same age as Misty
Gender: Female
Species: Unicorn
Personality: Shy, kind, serious sometimes, smart, brave, caring, clumsy sometimes, creative, helpful, graceful, courageous, curious
Appearance: Mint green and light pink mane in long twin braids with a light pink rose hair pin, light green skin and wears a mint green and light pink chiffon irregular hem sweet lolita long sleeve dress, gray tights, light pink mary jane strap shoes, a light pink crystal pendant and a mint green satchel.
Likes: Roses, Zipp, ice cream, creating stuff, children, singing, looking at the stars, fashion, flowers, painting, drawing in her sketch book, dancing, animals, winter, star maps, being with Zipp, dreaming, sunsets
Dislikes: Losing her friends, being alone, losing Zipp, Opaline, being reminded of Princess Luna's past as Nightmare Moon
Family: Misty (Older Sister), Cole (Younger Brother), Alphabittle (Dad)
Friends: Pipp, Hitch, Sunny, Sparky, Zipp (Secret Love Interest), Izzy, Crystal, Rusty
Enemies: Opaline
Others: Descendant of Princess Luna. Her nickname is Mari. Sees Zipp as her knight in shining armor. Her cutie mark are silver and blue crescent moons.

Sounds like Elle Fanning