A character in one of Shakespeare's play falls under the spell of narcissism when a helpful fairy gives him a donkey's head in place of his own because he thinks it funny. The play is A Midsummer Night's Dream, the character is Bottom (a Mechanical theatre actor), who hits bottom with this trick played on him by the prankster Puck. Under the spell, Bottom, who is ridiculous, narcissistically sees himself as marvelous as does the bewitched Titania. In Much Ado About Nothing, Beatrice and Benedick might be said to be narcissistic in their characterizations.
I believe Benedick is a character who is believed to be considered as narcissistic in Shakespeare's 'Much Ado About Nothing'. Benedick is characterised, and developed as a narcissistic man by the way he interacts with others, and by what others say about him.