Full fathom five thy father lies;Of his bones are coral made;Those are pearls that were his eyes:Nothing of him that doth fadeBut doth suffer a sea-changeInto something rich and strange.Sea-nymphs hourly ring his knell
In this passage it seems that Ariel can be a rather impish spirit in that he torments men with his songs. He sounds similar to Puck from Mid Summer Nights Dream and it has a rather interesting call back. In much of Shakespeare's work he tends to make the spirits and the magical creatures have impish tendencies. They tend to be entertained by the torment and the drama of peoples lives within Shakespeare's plays and I'm unsure as to whether this is part of English folk lore or part of Shakespeare's own imagination. In very few of Shakespeare's plays are magical creatures and beings ever truly revered and this makes for an interesting approach to the super natural. Here Ariel is looking and even mocking the loss that Ferdinand is feeling and is telling him that his father is dead. It wasn't instructed by Prospero to do this, but he does it anyway, which it really ties into the character of Ariel. These kind of actions remind the audience that Ariel is not human, but a spirit and it makes for a different way of interacting with humanity.