I have two flagship projects planned, and I've been worldbuilding for both of them with plenty of significant characters in the works. Unfortunately, with Real Life being a pain, it's safe to say that I won't be able to actually write these works anytime soon, at least until I get a steady job as something to fall back on for when I eventually need the money to publish them both.
For the first project, I've previously stated that I have a project that started out as a mega-crossover but now involves tons of expies of fictional characters in a multiverse of my own creation. "Heroes of Yonder" is basically an AU of popular culture as we know it - instead of so many continua being separate, interacting only sparingly and within their respective companies, the vast majority of fictional characters in this universe can meet up in a "world beyond worlds"-type place, broadcast to the real world in the style of an MMORPG/MOBA mix that's essentially a real-time fanfiction generator (you can play as both your player avatar/a generated OC a la the Mii Fighters from Smash 4, or as an "instance" of a "canon" character). The main antagonists are entities generated by players that were automatically rejected by Yonder's screening system for character legitimacy but somehow end up in whatever worlds they were intended for anyway, with the characters having to somehow get rid of them. It's a bit of a parody of fandom in general and fanfiction specifically, though I'm trying to make it a well-written story in its own right; the fact that several of my PPC characters either come from or are planned to be integrated into this project is enough of an incentive for this particular goal, I hope.
The other project I have planned is "Magizoic", which addresses and makes a decon/recon-fleet of one of the few things Heroes of Yonder won't cover, the Mons Game genre. Combining this with my love of speculative fiction, this is basically an AU future fic of Earth itself, where magic (and mana, its essence) is a thing, in no small part thanks to leakage from portals to the various elemental planes that cross over at the stellar coordinates of Earth, and a series of calamities has caused it to infuse the entire planet and all life upon it. Accelerated evolution, genetic and alchemical tampering, and alternative evolution have resulted in a wide variety of magical monsters known as Manazoids. In typical Mons genre fashion, combat with Manazoids is a worldwide sport, and one of the big highlights is a once-a-decade Olympics-style tournament - but the plot is kicked off by one of the countries participating suddenly imposing a punishable-by-death ban on Manazoid combat, with handlers of these creatures for that purpose being killed on sight. It's up to the main characters to escape the country, then figure out why, and finally undo this fatal policy and the world-destroying plot behind it - all before the tournament itself begins... in the country in question.
If anyone wants to talk to me about these particular projects, or lend their assistance with worldbuilding and character/plot ideas, please let me know! I'd be happy to get feedback regarding them both, so I can make these projects as great as they can be. :D