With the commissioning of the Scentury-Scented-Soap "Scentoons" in the late 2000s-early 2010s (we in the lore still haven't figured out if these were web shorts, an obscure show, or just unused and condensed down into ads) naturally they came with their own cartoon-like-happenings. A good chunk of these were "joke about character becoming fat/big that irreversibly alters you later in life", but one notable happenstance was when Butterscotch's good-natured (but incredibly ready-to-be-violent) sister Biscotti came to town! Right after she was created as a new character for the show, she just started...existing. Not as an employee at SSS, but just out there somewhere, with her sister. Some say she still fills in for Butterscotch at the offices when she's sick, though...

Uh, finally, I make a second one!! I had a frog one that I wanted to give away but Comet wouldn't let me so that one's just stuck in limbo. THIS, however, is Biscotti, always ready to stand up for her sister even if that means beating someone up. She knows martial arts!
Yeah she'll get fat too.

Of course btw, Lavender belongs to  ohnoohnox22 !