You may have missed it, but Chris Evans played The Human Torch aka Johnny Storm in 2005’s Fantastic Four and the 2007 sequel. In a new interview, he was asked if he was approached to return to the MCU via the multiverse as Johnny Storm, and he wasn’t opposed to it! “Look, I would love it,” Evans said. “I would love it. That would actually be an easier sell to me than coming back as [Captain America]. You know what I mean? Cap is so precious to me. And you know, I almost don’t wanna disrupt what a beautiful experience that was. But Johnny Storm, I feel like he didn’t really get his day. That was before Marvel really found its footing. So, I loved that role and, you know, who knows?”
Marvel has started work on a Fantastic Four reboot, but director Jon Watts just bailed (who did the Tom Holland-led Spider-Man trilogy). However, John Krasinski did show up as Reed Richards (Mr. Fantastic) during Doctor Strange In The Multiverse Of Madness. So who knows??