According to Sakuya, if she happens to run out of knives, she can freeze time and pick up the ones she threw previously.
According to ZUN, "Manipulation of Time" is synonymous to "Manipulation of Space". She takes advantage of this fact in several ways, from enlarging the space inside Scarlet Devil Mansion, to probably storing an immense amount of knives around. Maybe it's general relativity?
The characters for Izayoi literally mean "Sixteen-day-old moon", and Sakuya "Blossoming night."
In some fan-produced works, Sakuya is depicted with dog ears and a tail, probably a reflection of various characters referring to her as Remilia's dog. For example, in Sakuya's scenario of Perfect Cherry Blossom the three Prismriver Sisters offer to make her a part of the banquet by eating her. Lyrica starts singing "dog meat dog meat," implying that Sakuya is a dog. Sakuya is the only of the three heroines available that the Prismrivers threaten to eat.
There have been several clues spread across the Touhou series that suggest that Sakuya may not actually be human. Most of these occur in Imperishable Night, where Eirin Yagokoro is surprised to see her (according to ZUN). In another scene, she survives staring at the full moon (which should drive humans insane), and she has silver hair just like Eirin. These all seem to point to the possibility that Sakuya may in fact be Lunarian.
Sakuya may be a homage to Dio Brando, the main villain of the manga series "JoJo's Bizarre Adventure," a vampire who is known for stopping time and being skilled at throwing knives. (ZUN has also referenced JoJo's Bizarre Adventure in Shoot the Bullet Scene 65.)
5th stage boss. The maid is a human about 10~20 years old.
That power of hers distances her from the human race. She has given up trying to relate to ordinary people.
She does not care about honor or power; she thinks so long as it earns her dinner, being the Scarlet Devil Mansion's maid is fine.
She is the chief of the Scarlet Devil Mansion's maids and cleaning staff, and always takes advantage of her ability to stop time when working.
(If she cleans up with time stopped, dust will not fly around)
Since the master of this house is her, the maids also serve as personal attendants.
The elegant maid of the mansion. Has the power of manipulating time.
Sharp and able, her only weakness is being unable to take hot food.
Since the practice of throwing knives is similar to that of cooking, Sakuya is very good at cooking.
Recently she is waiting for valuable ingredients to make Chinese food.
In addition, her knives are recycled after throwing to save money and the planet.
When she runs out of knives during a battle, she stops time and picks them all up again.
Throwing knives are her weapon. Deceitless sleight-of-hand is her pride.
At first, she has 4 bombs. If your purpose is just clearing all the stages, it's pretty easy to fulfill.
"Jack the Ripper" targets the enemy staying in certain angles you're facing and fires thoroughly.
The power is lower, though it's so easy to use.
On the other hand, all of "Time Sign" weapons move tricky.
The shot of "Misdirection" is fired to where you move. Keeping it and changing to "Power Direction" makes the direction of shots unchangeable.
The bombs "Perfect Square" and "Private Square" both have weak power, but the time you don't lose your life is longest in three characters. Also, only the bombs enable you to move faster.
Most remarkable points are like this: in the bomb-effective time, the bullets of enemy will stop moving, and you can graze these. Plus, after the effect of the bombs comes to an end, the enemy's bullets change to bonus items, so the score for the bonus items you earn will be normal.
The more you graze, the more you can earn the score.
On the edge of a lake in Gensokyo is a scarlet mansion. She is a maid working there and gets no salary.
In this mansion, she's pretty hard as you imagine: cleaning, ordering, cooking and taking care of her mistress.
The mansion is unnecessarily large and has monotonous colors, so it's hard to grasp the details. If an uninvited guest strayed or was abandoned somewhere, nobody wouldn't notice it; if the guest was found or vanished, nobody wouldn't notice, too.
The scarlet building somehow has no strange atmosphere even in the Gensokyo surrounded by huge amount of green. It stands there as if it insisted its naturalness.
Living here, Sakuya also feels as if time stopped. Of course, it's not the reason Sakuya stops time.
A maid who works in Scarlet Devil Mansion and lives there. She does a maid's duty perfectly: cooking, cleaning, washing, nursing, throwing her knives, etc. Her position is a chief maid.
She looks elegant and perfect, though sometimes does odd acts. She works perfectly and quickly. It's because she stops time and work, perhaps...
She's also good at physical attack, which is better than that of suspicious trick like danmaku. That's why she throws knives as danmaku. Also, she loves a trickless magic, so she adapts them in a battle. I can't help feeling this point is the odd acts.
A maid who serves a devil.
She lives in Scarlet Devil Mansion. She can manipulate time.
In there, she works as a chief maid and represents the mansion because her mistress is what you would hasitate to introduce.
She has the loyalty to her mistress from the bottom of her heart, but there's no dirty atmosphere from the word "serving". Their relationship is so good that you cannot help liking them.
She sometimes does odd acts. It's hard to understand whether it's an intensionally act or serious one.
Needless to say, she's serious.
Her weapon is knives to throw. She considers changing another material for her knives because of the lack of silver.
Life as a maid is quite comfortable for her since she doesn't have to worry about clothing, food, or housing even though she lives very deep in the mountains.
She is sometimes hated by both humans and youkai because she lives and works for the Scarlet Devil. Nevertheless, she has friends who don't mind her employer and she doesn't need to worry about her living conditions. She can't imagine a life better than this.
A maid who serves a devil.
She's a human living in Scarlet Devil Mansion. She has the ability of controlling time.
Though her character is refined, she somehow makes odd behavior; it's not certain whether she's smart or considers nothing.
About the incident of flowers, she feels little danger.