Here is a List of a few Digimon Ideas. I will be honest, I will keep extremely vague to a degree, just so you can have fun being creative.

1. Light Bringer - What would've happened if Lucemon who has a rookie held the Power of several Mega Level Digimon, stayed an Angel? Stayed on the Side of Good? Or Perhaps if during Season Four when the Digidestiend Defeated Lucemon, His Good Data returned and reformed in from of them all. What he decided to merely help the digital wolrd and didn't want to rule but he still stand by what he believes that Order is needed at times you have to allow Darkness in or else greater evils take hold? You can do anything you want just as long as Lucemon stay in his rookie/Child/Angelic form and isn't a villain.

2. Warrior Rewrite - What if there different chosen child for Fronter? They Had different spirits? What it Zoey had Water, Koji Darkness, Takuya Earth, Jp Wood, Tommy Steel, and Koichi had Light (He was still evil first)? How would they fair with a different set of elements? What would this small change due for the long term?

3. Sins into Virtues = What would have happen had the Seven Great Demon Lords had a Pure Good Side to them? Know has the Seven Virtues? What if they had a Digidested Partner? What type of evil must be unleashed for the Seven Virtues to reappear? Lucemon (Angel Form though More adult Like so modfy it to make sense.

4. Sovereign = What would happen if during one of the many eras of time in the Digital World, that there was a need for the digidestined? These Four Digidestiend had the Digimon Sovereign as their partners. Huanglongmon is the great threat that must be stopped by the other four.

5. 13 Knights = What if there was a new cause for the 13 Royal Knights to be? 13 Digidested are partners with 13 Digimon that in time will become the Royal Knights. The threat they face can be anythigny ou want so long as you stay away from the Seven Great Demon Lords.