This is C-chan's second chibi set and the first of his images to debut Commodore 64-tan (the design was refined further in the C64/Amiga portraiture). Originally intended to serve as an avatar for a friend, the preconcept design was extended to debut C64-tan's older sister Commodore PET-tan, seen here carrying her pet triangular turtle LOGO-chan.

Except for the release of a larger size and the removal of the disclaimer notice, this version is completely preserved from the original Photoshop PSD files. None of the original SVG files contain the full artwork for this chibi set.