Can there be a "Joker" type film based on any Spider-Man character?
With the critical and financial success of [I]Joker[/I], I'm sure Sony is taking another look at the Spider-Man IPs to see if they can do something similar, a standalone project focusing on a villain's story without Spider-Man.
Is there any character they could use?
This is a bit different from Morbius and Venom, which are meant to launch their own franchises and could tie into the Spider-Man films.
One issue is getting a character with enough of a following who can work in their own project. Joker was the main villain in 2008's most popular movie, so he works in a way Sandman doesn't.
The Sony hacks revealed talks about a Kraven project, and while you could do a movie about a crazed hunter, he is largely unknown to filmgoers.
You could do a monster movie about the Lizard, but [I]The Amazing Spider-Man[/I] wasn't that successful.
The Osborns have the highest profile (aside from Venom) but they don't really work without Spider-Man.
One potential character might be the Hobgoblin. There could be a film about a businessman who discovers the lost technology of Norman Osborn, perhaps in the world of the Raimi films.