Panfandom

[…] scholars of fanfiction might instead question how this piece responds to the panfandom trend toward feminizing one male participant in a slash relationship (alluded to in Kustritz and Jenkins).

Source: wiktionary

Additionally, the multiple-fandom affordances of Livejournal have made "panfandom" FRPGs quite common-in these games, characters come from across multiple media sources and converge in a single world.

Source: wiktionary

Fan-run conventions such as 'Kazcon' (2007-09) and 'WinchesterCon' (founded as a Supernatural fandom event in 2007, and expanded to a panfandom event under the name 'Wincon' in 2010) […]

Source: wiktionary