Second Campaign idea considering running based on a fun game: Kingdom Hearts.
The idea is that Soulknife (Expanded Psionics Handbook) is used with a slight flavor edit to be used as the basic of the keyblade itself. The campaign will feature a gestalt where one side has to use Soulknife. The enemies used will have templates applied to roughly represent certain other aspects. The lore of the game has been for the most part ported into the desired format and enough to run with.
Allowed material: Core Materials, Races of ___________, Complete ____________, Expanded Psionics Handbook, Savage Speices, Magic of Incarnum, Lords of Madness, Book of Exhalted Deeds, Book of Vile Darkness, Tome of Battle, Tome of Magic, Unearthed Arcana.
Note: List subject to change or clarifications. Announcements to be made when the DM is able to.