Probably those who are still alive.
With Kevin Hart formally out of the running to host this year's Oscars (and with the flat-out academy refusing to take our advice, Who should actually host the ceremony, sounds like this? This year's TV show will instead feature several celebrity presenters who appear on stage to introduce segments, narrate some jokes, and ( full body shudder ) to participate in the academy-approved skits.
But, if ̵
"… To further increase the star quotient, the producers of the show are currently lining up for the show from as many well-known cast members from Marvel's extensive  Avengers franchise as possible. "
As THR continues to point out, this would not be the first time that the MCU family has matched for an Oscars performance In 2013, Robert Downey Jr., Chris Evans, Mark Ruffalo, Jeremy Renner and Samuel L. Jackson all appeared together on stage. A pretty good show, but certainly that could be improved significantly five years later, as a significant portion of the Hollywood-working actors and actors are now members of the Marvel family (also worth mentioning: the Oscars Air on ABC, owned by Disney is at the end of the day this would just be a good #CorporateSynergy).
Who makes the cut? No idea at the moment, but we'd like to bet that Disney / Marvel / ABC has put together an impressive lineup for the show. I mean, after all, they have a movie they can promote: Avengers: Endgame will be released on April 26th.