And there's an expectation that an Any requester will prompt for every nommed character, or only include requests which work equally well for them all, which gets super exhausting if there's 20 nommed characters, even if you do truly love them all.
I really do not think that's true. Giving prompts for every nommed character is ONE approach, but if you seriously do just want more fic for the fandom and don't care which characters feature, you could instead just talk about what in the canon you like, maybe focused on things other than the characters (settings, themes, tone, plot elements) and say "I'd love a fic that focuses on any of these things, featuring any character in the tagset you'd like to write."
no subject
I really do not think that's true. Giving prompts for every nommed character is ONE approach, but if you seriously do just want more fic for the fandom and don't care which characters feature, you could instead just talk about what in the canon you like, maybe focused on things other than the characters (settings, themes, tone, plot elements) and say "I'd love a fic that focuses on any of these things, featuring any character in the tagset you'd like to write."