Not many details are known about the car Ghost Rider, other than he's being played by Gabriel Luna, doesn't drive a motorcycle, and the character is named Robbie Reyes.
Now we do get a couple of details about Ghost Rider from Chloe Bennett as she hints at a Quake and Ghost Rider team-up. Bennet tells IGN:
It’s exciting! I was curious. It is always a little scary and you want everything to work well, but Gabriel is wonderful and fits in perfectly with the cast and I’m excited to see where they go with it. All the powers so far have been really rooted in something that Fitz and Simmons can always explain. I’m curious to see how they tie in a flaming head/skull on fire, and how they explain that with science.
I think we see that at the end of the season with her ability to kind of leap or fly. And so she’s become even more powerful. But that doesn’t come without a cost. I think you’ll see right away the repercussions of her powers not being monitored by SHIELD and you really see how SHIELD is necessary for people with powers.
Also check out the Ghost Rider teaser and Ghost Rider car:
"Agents of SHIELD" Season 4 premiers Tuesday, September 20th in its new timeslot of 10:00 PM ET.
Agents of SHIELD Season 4 Synopsis:
In the aftermath of their journey to another planet, Director Phil Coulson (Clark Gregg) and the rest of the team were driven more than ever to put an end to the Hydra organization. Little did they know that they were up against the deadliest threat they’ve ever faced – an extremely powerful Inhuman, Hive, who was transported back from Maveth in the body of their worst enemy, Grant Ward. The team was able to thwart and kill Hive and take down Hydra, but they are all still mourning the death of fellow agent and Inhuman, Lincoln Campbell.
In light of the Sokovia Accords, and with Hydra obliterated, S.H.I.E.L.D. has been legitimatized again and no longer needs to operate in the shadows. Since the world presumes that Coulson is dead, the organization needed a new Director (Jason O’Mara) to be the face of the organization. Coulson finds himself back in the role as an agent and teamed with Mack (Henry Simmons), and together they are tasked with tracking down and confirming the presence of Enhanced people, aka Inhumans. They have been trying to track down and capture Daisy (Chloe Bennet), aka Quake, who has gone rogue in an attempt to atone for sins from the past. But with the world believing that Daisy is a dangerous outlaw who has taken down banks and bridges, the new Director has no qualms about taking her down for good. Agent May (Ming-Na Wen) is tasked with training specialist strike teams, and Fitz (Iain De Caestecker) and Simmons (Elizabeth Henstridge) have taken a big step forward in their relationship. But with Simmons’ new promotion as Special Advisor to the Director in Science and Technology, Fitz, as well as her former team members, finds it hard to confide in or trust her since she’s now the Director’s confidant.
Robbie Reyes (Gabriel Luna) will roar into the lives of Agent Coulson and the team as a junkyard mechanic who can turn on a dime into the terrifying Ghost Rider. Will Robbie be a friend or foe to S.H.I.E.L.D. – as well as the world, itself? Meanwhile, Fitz discovers that socially awkward genius and friend Dr. Radcliffe (John Hannah) has started putting the finishing touches on a new, secret invention.