One simile that Oberon uses to describe himself is in Act III, Scene 2 of William Shakespeare's "A Midsummer Night's Dream" when the king of the fairies--or "king of shadows" as Puck calls him in line 363 [metaphor]--tells Puck,
But we are spirits of another sort;/I with the morning's love have oft made sport;/And, like a forester, the groves may tread (III,ii,406)
And, while there are a couple of metaphors used to describe Oberon--"king of shadows" and "captain of our fairy band"--any other similes are elusive, regrettably.
When Oberon and Titania first meet in Act II Sc.2 Titania addresses him as "jealous Oberon."
In Act III Sc.2. Puck addresses Oberon respectfully as "Captain of our fairy band."
A little later, in the same scene Puck addresses Oberon very reverentially as "King of shadows."
By making Oberon the fairy king 'jealous' Shakespeare has 'humanized' the supernatural fairy king so that the Elizabethan audience can easily relate to the supernatural world of the fairies.