She is owned by Youngmee Song's Aunt Christie
It's assumed that because of large sugar consumption, Buttercream has a ton of energy, pep, and sweetness, but she also has a mischievous streak which can land others in trouble. When she came over to Littlest Pet Shop day camp, she had shown to be a social butterfly, gaining the admiration of the other pets immediately.
In Topped With Buttercream, she led the pets to the next door sweet shop and broke into the pantry, eating loads of sweets. However, this led to a negative effect and everyone began to argue for the remaining candy inside the shop.
She often talks in rhyme and alliteration, much of which is nonsensical to the context of her message (e.g. "Thanky thanky cotton hanky"), however she has been shown to use her rhyming nature to convey a clear message (e.g. "Those sweet treats hit the streets").
Often, Buttercream is incredibly impulsive, but is often too energetic and upbeat for any negative impulsive decisions she makes to affect her personally. In Frenemies, after attaching a new tail to Vinnie out of a Wafer cookie, she then proceeds to eat it almost immediately, much to the dismay of Vinnie, Russell and Sunil.
She has a bizarre habit. Whenever someone asks her "What?" she responds "What?" then stamps her foot, and twists her ears, followed by her calming down before she says "Anyhoo..." afterwards.