Jim Carrey isn't a crazy sequel guy. Unless, of course, you're offering him the right amount of money and a place in the premiere shared superhero cinematic universe, of course.
In an interview with THR, Carrey said that he doesn't like to do sequels because, while he enjoys playing the characters, he's often simply imitating, even parodying his earlier role when he returns, especially years later for something like Dumb and Dumber.
However, Carrey did reveal that he'd be willing to make an exception for the right cinematic universe.
"I'm not a crazy sequel guy. That being said, if Marvel wants me to…" Carrey trailed off, before adding, "Neurotic Man! Man Who Doesn't Exist!"
Carrey doesn't appear to be keeping up on the names of actual Marvel superheroes, but Marvel could probably work around that if they want to bring him into the fold.