That is, if they were done right, and didn't suck. Some ones that would male sense would be something like Streets of Rage, or perhaps Shinobi as a film.
I'd like to see a big budget Fantasy Zone movie. No human characters, just a batshit crazy film about a sentient spaceship with daddy issues. I don't even want it because I enjoy the games, I want it solely to see the reactions to it from people who aren't familiar with the IP.
An Ecco the Dolphin movie, entirely in clicks and whistles but with English subtitles (I'm only half-joking). A more serious answer would be Burning Rangers. I can even imagine a Netflix series on Burning Rangers
I'd enjoy an Ecco movie if it stayed within 75 minutes of runtime. No subtitles, just communication with facial expressions and gestures, and a lot of good music. It would be the first video game adaptation to push into "art-house flick" territory. Burning Rangers would make too much sense. Since the game is so obscure and doesn't have enough of its own world to constrain a good producer, it's almost a blank canvas. Futuristic urban firefighters with high-powered equipment extinguishing skyscrapers and mega-factories. I would propose a Crazy Taxi movie that sort of lampoons slacker comedies from the 80s and 90s, but the people those movies were made for are now in their late 40s. There are not a lot of younger folk who enjoyed Fast Times at Ridgemont High as much as I did.
There are quite a few Sega properties that have an interesting theme around a medieval/fantasy setting clashing against a science fiction/space themed threat. I don't think I've seen that kind of scenario in too many movies. Something like Wonder Boy in Monster Land. You could present the film entirely as a fairly standard swords and sorcery fantasy quest, with the hero off to fight the fearsome dragon, only to reveal at the end that the threat is actually a robot dragon from outer space. You would have to be careful with marketing the film though, so as not to reveal the twist at the end (assuming no-one looks up the plot to Wonder Boy in Monster Land).
Daytona USA, the story of a scrappy new team on the circuit, of them starting up a team from nothing and learning to outpace the competition. Basically Rocky but with racing, which may already exist. Obligatory "try to go easy on the car!" line somewhere in the movie. Golden Axe, an action movie with a similar style to something like Conan the Barbarian. Starring a trio -- Ax Battler, Tyris Flare, and Gillius Thunderhead, though maybe those are pseudonyms or something, You could maybe have a joke about how Ax Battler doesn't use an axe. Narration would focus on one of the characters as they are screwed over by Death Bringer, swear revenge. Eventually they would meet the other two, find out they've been wronged by Death Bringer, team up, have adventures along the way of fighting him. Lost World Jurassic Park, based on the arcade game -oh wait.
I think the secret to a good Golden Axe movie would be to focus on Death Adder as the pseudo-main character, sort of like how Darth Vader is the main character of Star Wars and Thanos was the main character of the End game arc. You would need to have a really charismatic actor to pull it off, and once that iconic boss theme kicks in, it would be an instant hit, (You'd wheel out Death Bringer in the sequel, like how the emperor in Star Wars was the big bad guy pulling the strings behind the bad guy).
I posted my idea for a Crazy Taxi movie awhile back. Crazy Taxi: Fare Game - Plot - Taxi drivers who are upset they’ve lost business to rideshare services form an underground group to steal customers by hacking the apps. They break every traffic law to get people to their destinations in their modified cars. The police try to catch them but only one cop has the answer...Tom Wachowski. Given that Sonic lives with a cop it’s the perfect tie-in for the ending. It’s almost like they would have planned it. If they ever do a CT movie that is.
On the note of Golden Axe, Fleetway made a cool adaptation. I could see something like this working well in live action.
I would like to see a NiGHTs into Dreams movie (or a show would probably be more fitting, something formatted where it's led by a daily interaction followed by the dream stuff that ties back in loosely to what was going on during the day parts) since there's a lot of open endedness to what all you can do with the existing material, I just don't think anyone has the sauce to make it faithful and worthwhile. It'd also be fun to get a bunch of different covers of Dreams Dreams with different people as a sort of credits gag + Spotify bait because we absolutely need more of those in the world. Also it would probably incentivize a better rerelease of the existing NiGHTs content.
This was actually partly what made me think of creating this thread in the first place; that, and Fleetway's Streets of Rage adaptation. I can easily imagine Decap Attack being a fun kids series (if we want to go into TV series as well)