*Sour Sweet is a female human and a student from Crystal Prep Academy.

True to her name, Sour Sweet has a bipolar personality where she alternates between being sarcastic and rude and obnoxiously nice. She acts mean towards Twilight throughout Friendship Games, irritated by her thoughtless and clumsy behavior, which she believes will cost her team's victory in the games. Much like the rest of her school, Sour Sweet is highly competitive and confident in her athletic skill, and she is willing to use peer pressure against Twilight to manipulate her into using magic for Crystal Prep's benefit. After this ends up endangering both schools, Sour Sweet becomes remorseful and helps rescue her classmates alongside Canterlot High students.

By the events of Dance Magic, she still shows some signs of her bipolar personality around Rarity, but by the end of the special, she manages to show better control of it as her initial competitive spirit under Principal Cinch fades as the Shadowbolts and Rainbooms become better friends, especially with Crystal Prep now under Dean Cadance's kinder authority as the new principal.

Pretty girl with indigo eyes, yellow skin, cranberry hair in a ponytail or buns, Chrystal Prep uniform.*