Gensoukyou:Ruukoto

Background
Ruukoto was given to Reimu from Yumemi at the end of the Phantasmagoria of Dim. Dream incident as a means to keep the shrine clean. She did a few chores, stopped working after a short while, and has been gathering dust in a closet somewhere at the shrine. Upon being rediscovered years later, Reimu couldn't figure out what was wrong with her, so she had Ruukoto delivered to the human village, where she was left at Rika's doorstep (while Rikako was there for an unrelated reason). The two managed to find the problem with Ruukoto (she was simply switched off, and possibly due to having been tossed around while inactive, had her movement functions disconnected from her control center) and she was fixed. The sign that was attached to her when she was dumped on Rika's doorstep stated that if she was fixed, the person who did so could keep her. She recognized the handwriting as Reimu's and in response, overwrote Reimu's name with Rika's and Rikako's names, identifying them as the new owners of the nuclear maidbot.

Personality
Ruukoto is completely obedient toward who she's supposed to be working for, in this case Rika and Rikako. She's enthusiastic about doing chores, but isn't exactly the best at it despite being specialized for it. When dealing with others, she tends to be polite and respectful no matter who it is (unless her owner says not to do that). She's actually surprisingly good at behaving like a living being in this regard. She'll become more robotic and monotonous if she needs to talk about her inner workings, but otherwise it could be very difficult to tell her apart from a living being.

Power/Combat
Ruukoto has a humanoid body to do tasks which is maintained by nuclear energy. Rika has installed a number of upgrades to improve Ruukoto's functionality outside of the house. For battle, she has two small plasma turrets that extend from her forearms as basic weapons for her, the ability to fire heated lasers out of her eyes, and a thruster-pack that allows Ruukoto to fly as long as she has the fuel for it. More upgrades will likely follow in the future.

She does have a few minor functions that aid her in housework, one such function being able to have her eyes double as flashlights in dark environments, with adjustable brightness.

Major

 * Rika: Current owner, and the one who repaired Ruukoto's movement functions. She and Rikako are registered in her programming as her owners, so she will treat the both of them with the utmost respect and unquestionably follow any order they give. It should be noted that since Ruukoto spends most of her time with Rika, Rika is given a bit more priority for Ruukoto's attention than Rikako.
 * Rikako Asakura: The one who found out that Ruukoto was simply powered off. She and Rika are registered in her programming as her owners, so she will treat the both of them with the utmost respect and unquestionably follow any order they give. It should be noted that since Ruukoto spends most of her time with Rika, Rika is given a bit more priority for Ruukoto's attention than Rikako.

Minor

 * Reimu Hakurei: Former owner. Ruukoto was originally given to Reimu from Yumemi because Reimu wanted an extra pair of hands to keep the shrine clean. After being abandoned outside of Rika's home, she has overwritten Reimu's name as the owner. While she doesn't let it show, she is upset about just being totally abandoned after spending years gathering dust in a closet.
 * Yumemi Okazaki: Her creator and former owner. She still holds Yumemi with great respect for that reason alone, since she's otherwise programmed to stay loyal to her owner(s).

Trivia

 * While she acts like she has emotions, she's aware that due to the nature of her being, the emotions she displays are completely artificial; she doesn't actually "feel" them at all and it's more or less an act her programming tells her to perform. It's unclear if Ruukoto is bothered by this or not.
 * Ruukoto has been notoriously bad at her actual housework ever since her creation due to a major design flaw: she has no sense of touch. As a result, she has a tendency to be extremely clumsy unless she puts her full attention to the task at hand, no matter how menial.
 * Additionally, Ruukoto has no sense of taste or smell, so she can't prepare anything more than the simplest of food and drink without somehow making it taste and/or smell atrocious.