Princess Twilight Sparkle

Princess Twilight Sparkle (Formerly just Twilight Sparkle) is the 4th member of the "Main Six" and the first fully non-human to befriend the group. She was trapped in the human world after a mishap which occurred whilst attempting to travel to the Equestria Girls! Human world.

Bio
Twilight Sparkle is one of the main characters in The Story of Mew Lucy, and like her team mates (Excluding Vincent Dave), is a Princess. She is the smartest of the group and helps a LOT in battle with her intelligence and alicorn powers.

Trivia

 * She's the only member of the main cast whom is not a human.
 * She's also the strongest of the group, although Eternal Sailor Moon Is more or less the leader.