Xenix
Technical details
Xenix was a version of Unix developed by Microsoft in the 1980's. Xenix was predominantly based off of ATT's Version 7 Unix but also incorporated elements from BSD (unlike other Version 7 Unix derivatives) and originally ran on the DEC PDP-11 but was later ported to the x86 architecture, a line of Tandy computers and the Apple Lisa. Xenix was later acquired by the SCO Group and continued development as SCO Unix.
Character details
Xenix-tan is represented as a stern-looking woman with shoulder-length blue hair, amber-green eyes. She wears a maid's bonnet with a dark green dress under a black+white blouse with a white X-shaped bow on the back. She was a mediocre sorceress but excelled at melee combat, her weapon being a slender but powerful fiber wire which was primarily used for sneaky assassinations towards threatening program-tans.
She was the guardian of the Microsoft-IBM Family of the 1980's, was extremely loyal and very caring to the other OS-tans of the family but was notoriously strict when it came to many other people, could not take a joke at all and was extremely inflexible when it came to rules. It was because of her attitude towards most others that few people missed her after her retirement and death. She is survived by her daughter, SCO Unix-tan.
OSC notes/backstory
During her early years, Xenix-tan became friends with MITS Altair 8800-tan and wrote a biography about her. However, she was not allowed to speak of Altair-tan to the family.
Xenix-tan was first hired to be a servant and bodyguard for the soon-to-be Microsoft-IBM Family but quickly quickly demonstrated leadership qualities and rose very quickly up in the ranks of old Microsoft. She was around to raise PC-DOS-tan and MS-DOS-tan, and around for a while to raise Windows 1.0-tan, 2.0-tan and OS/2-tan but was retired shortly after Windows 3.1-tan (then Windows 3.0-tan) was born and didn't get the chance to see the family she cared for grow in influence. She did mellow out after she was forced to retire but she was still so intent on her work to be a good caretaker to the family that when she was drafted into the Unix Wars of the early 90's, she didn't make friends with any of her fellow Unices except for some other deviant Unices sent to the front lines.
She was still liked by the early Windows-tans and remained loyal to the IBM-Microsoft Family (and later the Windows Family) to the very end despite their increasing notoriety. Most of the other Unices, however, derided her as a traitor. Even so she never failed to defend the Microsoft Family as long as she lived. She died on the Unix Wars frontlines.