The Dark Tower (and its Beams) takes a different form in every universe. Some of these include:
- Haruhi Suzumiya, obviously.
- Azathoth, who lies in the centre of infinity, holding and creating the universe.
- The Planet Mildchilda, but the Infinite Library especially.
- The Heart of Kandrakar
- The Starborn Gem
- The Door To Revolution
- The Door to Light And The Door to Darkness
- The Door Of Truth
- The Gate Of Truth
- The Galaxy Cauldron
- Heaven's Gate and Hell's Gate
- The Star Road
- The Eye of Harmony
- The Monarch of Pointland (she takes up her entire universe and thus must be the Dark Tower)
- The Infinite Clock, the World Tree, and the Sky Tree
- The aforementioned Tommy Westphall.
- The Submachine Net
- Does that make Murtagh Roland? Or Flagg?
- The Portal Stones
- Tanelorn
- Callahan's Crosstime Saloon
- That fish shop. You know the one, the one they opened on Dagon Street...
- The fractal key
- Rupert Murdoch. This would explain a lot.
- Oban
- The Gates of Oblivion
- Spectra
- The Pillar of Cephiro was the Dark Tower until Hikaru made it so Cephiro was supported by the people of Cephiro.
- The Ark and the Halo Array
- That Gate The Gatekeeper is always going on about.
- And that Other Gatekeeper, too.
- The Portals from Spyro.
- The Instrumentality.
- The Internet in Real Life has the Tower's ability to bridge between realities.
- The Grand Master Key
- People's imagination, and to an extension, Imaginationland.
- The Jewel of Judgment, and by extension, the Primal Pattern. Depending upon interpretation, this may be reversed - the Tower could simply be an image of the Pattern.
- Witches
- The Heart of Ponyland
- The Crystal Heart and the Tree of Harmony. The Alicorn Princesses themselves may count.
- And that other gatekeeper and key master.
- The Shards of Adonalsium. Hoid is busy making sure this version of the Tower doesn't break any further than it already has.
- Mt. Aleph.
- The Triforce, with the various Sages/Temples guarding the Beams.
- Galactus
- The Monitor
