I've mentioned potentially having Gamera cross over with Marvel in the past (that thread been back in 2022) - owing to the fact Marvel has included Godzilla and Ultraman in their comics, so you might as well have Gamera as well to complete the "Big Three".

(When I say "Big Three", I mean that Godzilla, Gamera and Ultraman are the mascot characters of their respective companies - Toho, Daiei/Kadokawa and Tsuburaya).

Considering Gamera's powers across his incarnations - the most popular been his Heisei incarnation (as the films in the Heisei/90's Gamera Trilogy are considered among the best Giant Monster Movies ever made), while his most recent was the version of the character that appeared in the Gamera: Rebirth 3D anime series on Netflix in 2023 (which gave us arguably the strongest version of the character to date) - I do think there's plenty of ideas and themes you could play with.

Also, considering one of Gamera's abilities in the Heisei films was linking with a human (that human been a teenage girl named Asagi), you could potentially get a new teenage superhero out of it if it means he can share his powers with them (maybe call the new superhero "Trailblazer", since the character with the same name from the cancelled New Warriors comic isn't likely to be showing up any time soon).

As for how he shows up in the Marvel Universe, maybe have him appear while fighting another monster and getting pulled through a wormhole onto the Marvel version of Earth - along with his enemies, both monsters and aliens. (That wouldn't be unusual - one of Gamera's foes from a 2015 short film could shoot what appeared to be mini black holes, so maybe that could be altered in this case to make it a wormhole).

As such, you get Gamera helping out, fighting monsters and threats from this universe and his own, finally beating the main threat (which might be Zanon, this time in a ship that doesn't look like a Star Destroyer rip-off) and eventually getting back home; maybe "imprinting" his powers into Trailblazer's DNA so said superhero still have them without needing Gamera around and so Marvel gets a new character out of it without needing to reference Gamera all the time.

If you guys disagree, no worries.

^ tl;dr

@Your local internet guy - Alright, I'll abbreviate:

01. Have Marvel cross over with Gamera since they've already crossed over with Godzilla and Ultraman.

02. Gamera has a lot of power and abilities, with it likely been interesting to see him fighting a mix of his own villains (Monsters and Aliens) and various Marvel Universe threats.

03. If he links with a human and shares his power with them, Marvel might get a new superhero out of it during and after the crossover ends.

Is that better?

Yeah that’s good

Gamera is underrated

Agreed, and his newest incarnation was pretty powerful - his strongest attack been him firing a beam powerful enough to pierce through the moon and destroy a target on the other side of it.

I Hope we get reiwa films

Transformers

We did get a crossover with Transformers before (especially as Marvel was responsible for the Transformers comics for a time), but I definitely wouldn't mind seeing more interactions between the Marvel Superheroes and the Cybertronians.