By this I mean some sort of media IP, but one that isn't privately owned. How could an IP like this be managed, including characters, lore, etc?
Sort of related, but Pulgasari is rad as fuck and it would be cool to turn it into some kind of shared project. Maybe a dumb idea, but I just think it would be neat.
Touhou's somewhat adjacent to this, though restrictions apply. Sort of like a centralized open-source project. Its laissez-faire doujin culture is a key component of how it's been able to foster the following that it has. Honestly bet that 90% of first exposure to Touhou (especially in the West) is through non-official content.