|Nano Item||Leather Jacket|
|Voiced by||E.G. Daily|
Buttercup is one of the three Powerpuff Girls, whose sisters are Blossom and Bubbles. Unlike Blossom or Bubbles, Buttercup loves to fight and is considered a tomboy. Despite typically being considered the tough girl, she is capable of showing love toward both her sisters and Professor Utonium.
In FusionFall, Buttercup originally appeared in The Future as one of the few remaining heroes, with Samurai Jack, Dexter, Numbuh Two, and Numbuh Five, to have survived the battle in Tech Square to give the player missions. None of the other characters appeared in The Future, revealing that Buttercup was the only survivor of her sisters. She seems to have completely recovered from her memory loss, but oddly doesn't mention Ace at all. She does, however, mention that she had lost her memory and joined a band, but has now recovered. She was also the first Nano as well as the first Blastons Nano that the player created, until the introduction of the Academy.She originally could be found in front of the Mall in Pokey Oaks North near Numbuh Five in The Future. Returning to the past, Professor Utonium mentions Buttercup had a battle with Mojo Jojo over the ocean and was said to have never been seen again. She can be found in the Downtown section if the player performs the first part of the Music and Mayhem mission, in which Mandark needs Buttercup's leather jacket for Nano improvement, or if you are performing the Ms. Missing guide mission from Dexter. Apparently, Buttercup had amnesia but eventually regained her memory after her battle with Mojo. During this time, Ace takes her into his band under the identity of Belladonna. She can give out the "I'm Still Standing" mission, in which the player tells Buttercup's family about her whereabouts (in order of Professor Utonium, Blossom, and Bubbles) and participates for a few parts of the "How to Date a Fusion" mission, in which the player eventually faces Fusion Buttercup again. Buttercup also gives the mission Drop Your Weapons (Part 2 of 5) after she contacts you while doing the first mission for Coco, and Mandy contacts you when you are done with part 2.
She informs the player that Ace, the leader of the Gangreen Gang, had taken her into his band. She also mentions that Ace is her boyfriend (a possible reference to The Powerpuff Girls episode "Buttercrush"), as proven in the Valentine's Day event and the mission "How to Date a Fusion."
- If a player from the Future has already received the Buttercup Nano, it is possible to get the second Nano Mission from Buttercup and 're-receive' the Nano.
- Hers was the first original Nano, as well as the first Blastons Nano, received before the Academy was added.
- The original "un-Goth" Buttercup NPC is currently not found anywere in the game, since the future was removed.