So Sony wants to try and be Disney by releasing a Marvel movie every year, but they only have the Spider-Man property to play with - fine, let's see who (might) make for a decent film.
Keep in mind, all this should be taken with a grain of salt, because who knows which characters Sony has the rights to anyway. Besides, if they really wanted a cash-cow that kept on going (though not at the level of a blockbuster movie), they'd wise up and make Spider-Man a TV series. Moreso that almost any other comic book character, the melodramatic soap opera that is Peter Parker's daily life was made for the small screen.
Hobbie Brown is the Prowler, and despite his rather bad-guyish-sounding name, he is all hero. A young inventor from the poor side of town, Hobbie briefly considered crime before turning to crime-fighting full time - essentially Batman minus the mansion.
This one is so obvious, it's a wonder they haven't done it sooner. Morbius is a science vampire, that is to say, he used comic book superscience to cure his rare blood disease by turning himself into a vampire. Although he has given into his primal urges a few times over the years, he is a good man at (his beating) heart, so he does everything he can to fight evil, including the desires in his darkened soul. In more recent comics he has become head of a self-appointed monster police squad, keeping the peace amongst monsters living under New York City. Oh, and on the plus side, he doesn't sparkle.
Kaine, the Scarlet Spider
Although currently calling himself "Scarlet Spider" and hailing from that pit of despair comic fans know as the Clone Saga, Kaine is an interesting and complex character. He was a failed clone of Peter Parker (paid for by Norman Osborn, because that guy's into everything) who has all of his powers and a lot more rage. For a long time he was horribly disfigured and used his ability to burn people's faces off to murder anyone he felt deserved to die (the vast majority of whom were bad guys, so I guess that's okay?). As soon as his face was healed he decided to become a full-on hero because Beauty = Goodness apparently, so he doesn't (usually) kill anymore. His recently cancelled comic carried the tagline "All of the Power, None of the Responsibility," which to be honest, is a bad ass movie tag line.
Let's pretend Halle Berry never made a solo superhero movie and move on. The Black Cat is a bad girl who wants to be good. Sure, she's something of a kleptomaniac with a mask fetish, but who isn't? Plus, aside from all of the acrobatic and martial arts skills one would expect of a movie-quality cat burglar, not to mention the requisite retractable claws in her gloves, she (more often than not) has genuine superpowers! Her ability to cause others bad luck might not seem all that snazzy, but with the right director, that could rival Daredevil for cool subtlety. Most interestingly, she dated Peter Parker/Spider-Man for a long time, but she only really loved him as Spider-Man. There's a lot of psychological layers that could be dug through with that one.
Yeah, so the movie version was horrible, hear me out. In the comics, Curt Connors has long been one of Spider-Man's most trusted friends and deadliest enemies, a fact that bothers Curt more than anyone else. He often finds himself struggling with helping Spider-Man with science stuff, trying to save his family, and internally battling the Lizard (a distinct personality that hates all humans) all at the same time. Recent comics have added a new wrinkle when Curt has allowed himself to be thrown in jail, all while refusing to tell anyone his mind is in charge of the Lizard's body because he believes he deserves to be locked up permanently for his crimes, even if Peter Parker and others believe Curt himself is an innocent man. He also has a small (but workable) rogues gallery, including Stegron the Dinosaur Man and the Iguana (an actual iguana).
Terrorist-fighter James Bourne, AKA Solo, never really caught on in the comics, but as a military weapons expert with a Star Wars-inspired nom de guerre and an actual Bourne identity, he's made for the movies. He's basically Punisher minus the moral ambiguity and Deadpool minus the psychopathy.
Leaving aside Spider-Man's alternate-reality possible-future daughter (because although she is a fan-favorite, her existence would confuse he hell out of general audiences), the current Spider-Girl is Anya Corazon, the daughter of a tough-as-nails investigative reporter and heir to a mystical legacy of spider heroes (among whom Spider-Man is included). Her powers are magic-based, but distinct enough from Spider-Man to make her her own hero. On top of that, she avoids a lot of the other teenage superhero clichés by having an entire army of people training her to be a hero, including the Spider Society (a mystic order of spider-based mages) and superheroes like Captain Marvel and Spider-Woman.
While near-future characters like Mayday Parker might be too hard for common movie-goers to wrap their heads around while still accepting Peter Parker as a young single hero, a hero from 100 years in the future is another story. Miguel O'Hara is (will be?) a scientist working for one of the corporations that rule America in the year 2099. If Guardians of the Galaxy works out, this could be Sony's shot at the cyber-punk gold.
The Venom most non-comic readers (or those who haven't read comics in the past 10 years) know is Eddie Brock, but to be blunt, Eddie Brock is not a great character. Eddie was introduced only a few issues before becoming Venom, and somehow in those few issues he was supposed to have developed a lifelong hatred of all things Peter Parker. After the character's initial popularity (due in no small part to Todd McFarlane's designs), numerous attempts were made to turn him into a real anti-hero, but none of the stories really clicked. Recently, the Venom symbiote has been given to Flash Thompson, someone who has an actual reason to hate Peter Parker after bullying him in high school only to be publicly embarrassed when "Puny Parker" beat him in a fight. Ironically, Flash was also Spider-Man's biggest supporter and president of the Spider-Man fan club. As an adult, Flash served multiple tours for the military, eventually losing his legs in the war. As Agent Venom, Flash has (almost) complete control over the insane symbiote and uses it to go on black ops missions for the government and other superheroes.
As an added bonus, Flash Thompson comes with an interesting new character. Other attempts have been made to have a female Venom, but none of those worked out too well. The new Mania character, on the other hand, is visually striking and comes with added teenage angst. That's movie material right there.