Sweetie Belle

Sweetie Belle is Rarity's younger sister in My Little Pony: Friendship Is Magic. She, Apple Bloom, and Scootaloo form the Cutie Mark Crusaders.

As Tagalong Rabbit in Kovu Hood
She is a rabbit.

As Olivia Flaversham in The Great Gecko Detective
She is a mouse.

As Cynthia Brisby in The Secret of NIMH (Nuclearzeon Animal Style)
She is a mouse.