Thor

 Short Answer: When Thor met Throg

Of all the MCU characters, Thor is the one with four movies already. Clearly, they are going to keep making these, clearly they are going to keep the same cast and production team...

and clearly, they are going to keep getting even weirder.

Which, this being a comic book-based series, is not a problem.

Sure, we could start to explore the stories in which Thor loses his powers and becomes Dr. Donald Blake. But... pardon me while I yawn. Also, we already have a Hulk who powered down into a nerd. And Thor already lost his powers in his very first movie. And the "superhero loses his powers" thing has been done by everyone from Superman to Disney's version of Hercules. And... no.

No, the way to go is to follow the lead of the Spiderverse. And get animated.

Why? To tell the story of how Thor... became a frog, while still having the power of Thor. He meets a human-turned-frog who gains the power of Thor and changes again, into Thor-frog... or just Throg, for short. As we learned in Love and Thunder, Thor-ness is at least temporarily transferable. 

Yes, while all this cosmic stuff is happening, a lot is also happening on a very small scale which-- as we saw in the Ant-Man movies, can be just as epic. And yes, Ant-Man is getting another installment called Quantumania, but why not have him make an appearance here, too? We haven't had a Thor/Ant-Man team up yet. Two of the funniest MCU quipsters in one movie? 

Still not Deadpool, but still pretty good.

The Marvel stories are going to keep getting weirder-- Dr. Strange has the multiverse, Ant-Man has the Quantum Realm, Wanda can create her own realities, the Guardians of the Galaxy are interplanetary, Iron Man made time travel a snap (oooh! Too soon?), America Chavez can open portals...

So why not ride the wave with Thor, who already can zap across space on the Bifrost? 

And when we need to dial the MCU way back down and re-ground in reality, we can always have Thor become Dr. Donald (yawn) Blake.