i'm not sure if this would be apt for a pool, nor on what the requirement for it should be, or if it should be broaden into just "Indie Crossovers", which would also be complicated to clarify requirements
the favgroup is mostly just me copying the results of "yume_nikki copytags:>1", i cleaned up some of the more blatant ones that don't apply to the concept but the favgroup is hardly ready for conversion into a pool for many of the before described reasons