Apple Lisa
The Lisa is the true predecessor of the Mac OS, incredibly powerful for its time and much more advanced than the Macintosh, having a 5MB hard drive (The first Macs did not have any hard drive), 1 MB of RAM, had cooperative multitasking (not introduced to the Mac until System 4.2), virtual memory (not until System 7) and protected memory (not until OSX) but was very slow and ridiculously expensive at a price of $10,000. The Lisa slid out of favor when the Macintosh was introduced at 1/4 of the price.
Lisa-tan is depicted as a former aristocrat turned clinically depressive. She has silver eyes, blonde hair partly in pigtails with a long cowlick across her face, dons a fancy white dress, grey + white gloves and diamond tiara and still wears them despite not having a decent suitor in several years. She was an aristocrat who was charming at first but unintentionally spoiled by her proud company and older sister, Apple ][-tan. Unfamiliar with menial tasks and computer games, Lisa-tan would rather mingle with the affluent than the petty home user. Lisa-tan's depression began to set in when Macintosh System 1-tan arrived and Lisa-tan's wealth and followers gradually siphoned off to her. Then something happened in 1989 that traumatized Lisa-tan completely, and she has never spoken or functioned normally ever since.
She is now perpetually melancholy and rarely talks and never smiles but expresses herself though poetry. She is still able to perform the menial tasks she despised years ago and learned to assist Apple ][-tan with tasks such as picking apples.