Hmm...Season six ideas...
Well, I have been having tons of original Digimon Season ideas. Maybe some day I would plan them thoroughly enough to actually write them.
One is a expansion of that Digimon Chronicles manga. I like what little I saw, so I elaborated upon it. I have plans for a lot of things, like Kouta and DORumon's close friendship; Yuuji's sensical and sarcastic attitude; Shinji's strive to be perfect; and other plot points. I've also introduced some original characters I made up to partner with all the other Royal Knights (Now, if they would just reveal the remaining knights...) and the main female character, Kasumi.
Kasumi is a very energetic and maternal girl, though somewhat eccentric and girly. She has been known to sew pajamas and other garments for her friends (Even offered multiple times to make a knew cape for WarGreymon X.), try to ring them into tea parties and attempt to engage everyone for some form of "friendship time." It is often questioned whether she is even in touch with reality. Despite her oddities, though, Kasumi has an ironclad protective streak and has often participated in battle, using her martial art skills to take down lower level grunts. Her partner Digimon is Plotmon, who evolves to D'Arcmon and weilds her staff for justice.
Another is a semi-sequel to the above, except it takes place in the Real World and the main characters fuse with their Digimon in order to combat threats from another Digital World. The main character is an energetic, dorky girl, who wears goggle glasses and has lots of book smarts, to say the least. That's all I'll say about the main characters at the moment, though I'd like to get to the villains.
The antagonists - consisting of a boy known as the Digital Count, Fangmon, Phelesmon, Bastemon, Pokyupamon, and a woman in a devil suit- wouldn't have much motivation for causing trouble, except for passing the time. They don't plan to ever take over everything - they'd consider that boring. The bad guys much prefer to travel around, stirring up chaos and screwing with people's heads for their amusement. The Digital Count and his comrades are evil to the core and aren't the type that would change their ways. Despite their malicious nature, they maintain a strong, but subtle friendship, willing to put their lives on the line for each other. Fangmon and the Digital Count are particulary close - if they were ever in a tv show, the more crazier yaoi fans might actually slash them.
Well, that's all I have to say at the moment. I have many MORE ideas, but I won't bore you with long posts.