In nearly all the videos, despite the actors playing the likes of Captain America and Spider-Man in the movies, they flip the roles and credit Josh as being the real hero.
Ryan Reynolds who plays Deadpool said:
It’s pretty much a fact that you have more courage and more strength in your pinky finger than any superhero does in their entire body.
Chris Pratt, who plays Star-Lord in Guardians of the Galaxy added:
I think real heroes are young people like you have to face challenges and do so with the bravery... that you do.
If you'd like to contribute to Josh's families efforts to help tick of the rest of his bucket list, which includes a trip to Disneyland and volunteering at an animal shelter you can donate to their GoFundMe page.