Gensoukyou:Luna Child

Background
Luna Child, much like any other fairy, came into being through the combination of nature and magic. She was "born" on the night of a full moon, so her individual power was closely tied to it. Maybe a decade or so after she was "born", she met Sunny Milk, who at the time was trying to prank the same person that she was. The two of them wound up messing up each others' plans and they got into a little tussle as a result. Oddly enough, the two of them came to a mutual respect, since Luna came to a realization when Sunny demonstrated her unique ability that if it were combined with her ability to mute sounds, the two of them could become nigh undetectable by humans. The two started hanging out and working together on pranks, finding much greater success than they did individually. However, the ones that did fail failed rather spectacularly, often due to the two of them not realizing they'd been caught in the act or just didn't have an escape plan. About a year or two later, the two met Star Sapphire on the run from a failed prank of her own. By the time they met up, Star had already given her pursuer the slip, and after a quick conversation, she too teamed up with Luna and Sunny to become partners in crime as the three Fairies of Light.

The trio would eventually settle down in the Forest of Magic, living in a tree they re-purposed into a house. Years pass with more or less the same routine, Sunny schemes up a plan, the three play a bunch of pranks, some more successful than others (and sometimes ending with only Luna and Sunny getting caught), shenanigans and hilarity ensue. They would eventually move their home to another tree close to the Hakurei Shrine, where they picked up business as usual as inseparable friends with a big mischief streak.

Personality
Luna behaves much like a typical fairy: childish, mischievous, and curious. In addition, she's notably quite clumsy, being prone to tripping over anything...or in some cases, nothing. She's often not trusted to handle anything that can break, especially when it's critical for one of Sunny's more "elaborate" pranks to succeed. Surprisingly, Luna is actually pretty logical for a fairy. One of her favorite hobbies is reading various things she and her partners have acquired, be it newspapers, books, or what have you, so she actually has a good amount of book-knowledge, for a fairy. She's also a bit of a skeptic, often questioning things that seem too good to be true or just outright unbelievable for whatever reason. She has a bit more common sense than your typical fairy, though not as much as Star Sapphire. On the other hand, she still has a notable lack of practical smarts, so despite her own skepticism, she'll often provide unfeasible or outright impossible solutions to even the simplest of problems. Best not to come to her for advice.

Power/Combat
It's no secret that fairies aren't exactly terribly powerful, and Luna Child is no exception. What power Luna Child does have is an ability to mute sounds in an area around her, be it the sound of a bird chirping, the sound of the wind blowing, or more practically, the sound of her footsteps or her wings flapping as she's approaching a potential target. Her power level fluctuates somewhat dependent on the moon; if the moon is absent, be it because it's daytime or a New Moon, she's weaker. If the moon is present, she gets stronger dependent on how full it is. Luna's danmaku power level never exceeds slightly above the average power level of a greater fairy, so most people won't find her THAT much of a threat. Luna can also combine her power with Sunny's to make the two of them nigh-undetectable.

Spellcards
lol

Major

 * Sunny Milk/Star Sapphire: These three fairies live in the same house, are very close friends, and could be described as partners in crime. While they can do individual smaller scale pranks, Sunny will frequently present the other two with a plan to execute a larger scale prank that usually involves using their individual talents to make it work. Luna would never give up their friendship for anything, and is very happy with the lifestyle she leads with Star and Sunny. She seems to have a closer bond with Sunny Milk than Star, since she's known her longer.

Minor

 * Cirno: Fought in a small war once, and has sometimes been an accomplice for some pranks. Despite the war, they seem to be on good terms now. Luna finds her ability to use ice so well somewhat fascinating.
 * Marisa Kirisame: Luna, along with Sunny and Star, have been customers to the Kirisame Magic Shop every so often. Additionally, she's sometimes a victim of the trio's pranks.
 * Reimu Hakurei: Another frequent target, due to the fact that the trio lives right near the Hakurei Shrine. Reimu has caught them in the act a few times, wound up sealed once or twice, but it's hardly deterred them from having her be a target of a prank.
 * Humans: The three of them tend to target humans with their pranks, so it's no secret that they have a minor reputation in the village for being such troublemakers.

Trivia

 * Luna has a strange like for coffee beans. She'll sometimes go as far as to steal some from humans without a sound.
 * She is also fond of alcohol, but is the textbook definition of a lightweight, given that she's a fairy. One sip of a tanuki brew would probably knock her out for at least an entire night, with a bad hangover. She usually sticks to weaker brews to prevent stuff like that from happening.
 * Something slightly annoying is that she does need reading glasses when she's reading small print.