"That would be sexy," Rodriguez told us on Wednesday. "We've definitely got to bring up the ante, man. Whoever it is -- it has to be a powerful presence that hasn't been seen before."
One thing she knows for sure is she doesn't want her female costar to be her enemy.
"The grand majority of the time in films, we're always fighting each other. I feel like it's time to evolve girls. Let's stop hitting each other and let's stop fighting each other, and let's start getting together and ganging up on people."
And she further explained that the film's plot needs to stay just as fresh.
"Whatever the storyline is, it needs to be relevant. I think there's only so many times that you can keep repeating history," she explained. "What happened with Fast 7, I don't want to say it's a fluke, but people came out of the woodwork to show love for Paul, and that's something you're not going to have in the equation with the next one. Whatever it is that they cook up needs to touch the hearts and souls of people."
If she had it her way, one way she'd change things up is setting the film in the Big Apple.
"New York's just a melting pot," she gushed. "There's so much to discover there -- motorcycle crews, everything from the Hells Angels' home -- you've got a lot you can play with in New York," she said.
Another way to change things up? Add Helen Mirren -- who has been very vocal about wanting to join the franchise -- to the cast, something Vin Diesel is very excited about.
"There are so many options!" Diesel told ET in April when asked about possible roles for the legendary actress. "You've got Nathalie Emmanuel's mother. You've got, of course, the matriarch to the Shaw brothers!"
Fast and Furious 8 is set to hit theaters on April 14, 2017.