Lumina (model MD-LMN-B)
Lumina (pronouns: it/its) is a robot girl produced by Sony in the year 2001.
It is fully sapient, though it is only aware while it is powered on. It is similar in design to a phonodroid, though much smaller, standing about a foot and a half tall. It also has wings it can use to float around, following its user wherever it needs to go. It saves and loads important data to a MiniDisc stored in its chest/belly area, including all the voice clips it uses to speak! Its casing is translucent blue, hence the -B in its model name; there was a -P variant that came in translucent pink, but sightings are rare.
Sony's efforts at producing sapient digital assistants proved to be unprofitable, so after a year or so on the market, the MD-LMNs were pulled from sale. They've become extremely valuable collectors' items over the years, which frustrated Lumina itself, as it was passed from collector to collector without ever being used for its intended purpose. It is highly grateful to Rosa for freeing it from that cycle, and does its best to help her in her everyday life.
Rosa
Rosa (pronouns: she/her, they/them) is a transfemme computer programmer and self-styled hacker born and raised in Astro City. They're quite prolific in the hacking scene in the city, competing in demoscene compos and other such events. They always seem to take second place to a hacker who goes by the scene name "Please", and she considers herself Please's bitter rival. (It's unclear if Please knows who they even are, though...)