The bulk update request #9419 is pending approval.
create implication hazbin_hotel (5227) -> hellaverse (32)
create implication helluva_boss (37631) -> hellaverse (32)
Reason: The shared setting of Hazbin Hotel and Helluva Boss is named the "Hellaverse" (used by series' creator Vivienne Medrano in all these tweets)
By childing these tags to hellaverse, you could collectively search not only hazbin_hotel or helluva_boss, but posts with fan characters that do not necessarily "belong" to either series.