Touhou 1.5

The true identity of natural phenomena themselves.
Fairies live in such phenomena where it gets cold and hot, rain falls and wind blows, grass grows and flowers bloom.
They come in various shapes, but many of them are humanoid with wings like those of the insects called butterflies and dragonflies.
Height is uniformly small, from the degree where they can fit in the palm of one's hand, up to the size of a child below ten years of age. There is hardly any fairy outside of this scope.
They live wherever there's nature.
You can confirm their existence anywhere in Gensokyo.
They specifically prefer noisy places, so when humans and youkai gather you can probably spot lots of them.
On the other hand, in gloomy places their numbers decrease.
They are a kind of youkai you frequently can see even in human villages.
Time of activity is diverse, so you can probably encounter them both at daytime and in the night.
It seems that there isn't any regularity
Still, an individual fairy is short-lived(*1), but they immediately resurrect in the same shape.
Even if they suffer large injuries so that their bodies are in pieces, they heal immediately.
In a stricter sense fairies can't die.
Therefore they take reckless action, without fearing death
Since their concept of death differs from that of humans it may look so, it is also said that they simply are stupid.
Fairies don't really need to eat, but they see the way humans deliciously eat their meals, and copy them and eat the same things as humans.
They eat anything which humans eat.
They especially like to secretly steal that which humans are planning to eat.