Oberon appears as a male fairy of perhaps unusual size (4'6") with no wings, and strongly muscled by fey standards. His cloak is made of green leaves stitched into brown leather.
Oberon is the consort of Titania and a member of her Seelie Court. He is the father of Damh and Verenestra. Eachthighern allows Oberon to ride him. He is called King Oberon, but this is an honorific due to his marriage to Queen Titania; he has little political authority among the Seelie Court.
Oberon is stern and strong, but happier out hunting than dealing with the politics of the Seelie Court. He is aware that his intelligence and wisdom, though high, seem low compared to his wife's attributes. He is a protector-god, using physical combat more than illusion and camouflage as most sylvan deities do.
Oberon is revered by all nonevil fey, who pray to him for protection.
In Dragon #263, a non-divine King Oberon was presented, this version a chaotic good, 20th level fighter/mage who appears as a large, blond-haired human-looking man with green, diamond-shaped pupils set in black irises. He is called the King of Shadows and he rides a pegasus called Moonbeam. In that article, the chief distinction between Oberon and Titania is that Oberon governs magic and unnatural things, while Titania governs the natural world. Another non-divine King Oberon was created for the world of Mystara in Tall Tales of the Wee Folk, where he appeared as a 30th level warrior sidhe of neutral alignment (lawful tendencies). In both of these versions, Oberon and Titania are depicted as a quarrelsome couple, though Oberon is the monarch and Titania his equally powerful consort.
Oberon and Titania have switched roles in Monster Mythology from their Shakespearean counterparts in A Midsummer Night's Dream as the King and Queen of the Fairies. In Shakespeare, Oberon ruled the fairies with Titania as his consort, but this is reversed in the role-playing game. The exact reason for this switch is not clear, although in British folklore the fey are usually ruled by an unnamed Queen.