Wind/stormy weather. Seems to be a personified antagonist, because it is described as "threatening" and that it "seized" their breath Daffodils. Personified as dancing, happy flower friends, who "rested their heads" on stones like "pillows" and dance in the stormy weather.
The characters in your story seem to not necessarily be a person like in this case the win and the daffodils are being personaified in being described in the story