Agents Of SHIELD: 8 Characters Who Need To Return In Season 6
1. Ghost Rider
Last Seen: Season 4
It's hard to deny that the Ghost Rider arc that made up the first stretch of the show's fourth season turned out to be one of its most popular storylines. Aside from the fact that the special effects that brought the character to life were pretty stellar for a television budget, Robbie Reyes was a compelling character all his own, and his return at the end of the season gave rise to a great moment in which the Spirit of Vengeance took over Coulson's body to help destroy Aida.
Though he was last seen returning back to Hell, it's somewhat of a surprise that he didn't return in the fifth season considering how Coulson's pact with the Spirit saw his fate hanging in the balance throughout the season. With how popular the character turned out to be, it would be disappointing for him not to return from Hell - or wherever he may be nowadays - for one last ride.
Even further, Johnny Blaze is out there in the world, seen briefly in a flashback as the one responsible for passing on the Spirit of Vengeance to Robbie, and should any version of Ghost Rider never actually return to Agents of S.H.I.E.L.D., the door is wide open for a whole world of storytelling around the character should Marvel ever want to build on the foundation that the show has built.