Response: in The Return of the King, King Théoden and Lord Denethor represent obvious character doubles. Tolkien emphasizes their doubled nature by alternating chapters devoted to Théoden and Denethor in Book V. When we meet them, both rulers are destitute, brought down by the influence of evil in their respective realms.
In a more profound way, Frodo and Gollum function as doubles as well, embodying the two opposite consequences of bearing the Ring. Both are small, but Gollum is smaller—a shriveled, black, and dirty version of a Hobbit. In one sense, they are opponents, united only by Frodo's mercy and forbearance. In another sense, Frodo and Gollum are one and the same. Gollum represents Frodo's id or inner self—the portion of Frodo that yearns for the Ring.
2nd Edition•ISBN: 9780312676506Lawrence Scanlon, Renee H. Shea, Robin Dissin Aufses 3rd Edition•ISBN: 9781111445072Darlene Smith-Worthington, Sue Jefferson 3rd Edition•ISBN: 9781133467199Darlene Smith-Worthington, Sue Jefferson 3rd Edition•ISBN: 9781111786786Darlene Smith-Worthington, Sue Jefferson