The trickster character is a complex character, a master of guile and deception. Loki was not so much a figure of unmitigated badness as a kind of celestial con man. He would often bail out the gods after playing tricks on them, as illustrated by the myth in which he shears Sif's hair and then replaces it, or when he is responsible for the loss of Iðunn's apples of youth and then retrieves them again. Loki is an adept shape-shifter, with the ability to change both form (examples include transmogrification to a salmon, horse, bird, flea, etc.) and sex.