6. Happy Hogan & Pepper Potts
From where I stand, not having Stark Tower make an appearance on the show is something of a fail. Tony's contract has run its course for future Iron Man movies, and though he has signed on for two more Avengers movies, I don't think it is reasonable for us to have to say goodbye to these two characters. They are a major part of the Iron Man portion of the MCU as the head of Stark Industries and its head of security. Both Jon Favreau and Gwyneth Paltrow enjoy making guest appearances on TV, so while we are waiting around on the future of one franchise, why not add them in another? It would be interesting if the team were to have a domestic job and they were to be granted use of Stark Tower as a sort of field operations base. As the two have appeared in more films in the series (outside of Samuel L. Jackson), I would think that Marvel might seek out their services for a cameo... Maybe Jon could even direct the episode?