,
Its an old Japanese thing, where children collect fluff or originally I think fox or animal fur/hair, and you rub all the fur/hairs together to make a ball.
It becomes like a pet that is supposed to give you good luck.
You can color it with flour or face power and this is also like feeding it.
In anime or more commonly know the kesaran-pasaran is kinda of this cute white fuzzball that you just find. But there is no evidence that to suggest this such a creature or thing has existed.
A myth is that a mother who had lost her whole family and her home in the war
started creating Kesaran-pasaran out of sheer loneliness and despair.
She used fox and cat hair and powdered it, I guess it was her only comfort and replaced her family.
Drew