Characteristics

Hair: Black
Eyes: Green

Origin

"Sugar, spice and everything nice, these were the ingredients chosen to create the perfect little girl but Professor Utonium accidentally added an extra ingredient to the concoction chemical X thus the Powerpuff Girls were born. Using their ultra super powers, Blossom, Bubbled and Buttercup have dedicated their lives to battling the forces of evil"

Buttercup is the black sheep of the Powerpuff Girls and is known as the "tough one". She was named Buttercup by Professor Utonium because of it also begins with a "B" and it'd be uniform with her sisters' names "Blossom and Bubbles" . Buttercup has no unique powers to her her own name but she is the only one among her sisters who can curl her tongue, a characteristic which is not as impressive as ice breath or speaking different languages but is her a trait she can call her own. Buttercup is also a tomboy and is very reluctant to do anything that she considers weak of girlish, like kissing the Rowdy Ruff Boys to defeat them. Buttercup can be a handful with her potty mouth and her enjoyment of violence but she has proven to be a loyal member of the group.  She often tries to usurpe Blossom as the leader, causing major arguments between the two of them. Buttercup also enjoys tromenting Bubbles and referring to her as a "baby".

Powerpuff Girl Z

In the Japanese version of the Powerpuff Girls Buttercup is Powered Buttercup. Her name is Kaoru Matsubara and she shares the original Buttercup's characteristic as being a tomboy. Kaoru was reluctant to join the Powerpuff Girl Z because it meant she had to wear a skirt. Kaoru is popular in her school for being very athletic and skilled in sports. Kaoru is also very quick to anger. In this series Kaoru is not related to the other Powerpuff Girls. She has a different family made up of a mother, a father and two brothers. Though she is a tomboy Kaoru actually enjoys kissing one of the Rowdy Ruff Boys unlike Buttercup in the American series.

In the cartoon on Cartoon Network Bubbles is voiced by voice actress Elizabeth Daily.