> Charlie Brown, Donald Duck, Goofy, George Costanza, Eeyore to name a few.

What about real people (not animation characters for children)?

Could "Mr. Bean" only be created by the Brits, or if not, where is his U.S.-American counterpart?

> “Iran can't hit back over Soleimani's killing.¹ Who will we take out? Spider-man or SpongeBob SquarePants? They have no real heroes.”

But, fwiw, I don't think I agree with you. Mr bean is just as fictional as charlie brown, the medium or original intended audience doesn't seem very significant to me at all. Also george costanza is in there and I think 90s-2000s american sitcoms actually have a lot of the kind of character you have in mind.

¹: I don't agree with the quote either. As this article and comment section makes very clear, heroes and the definition of heroism are culturally embedded and not fully legible to outsiders, like probably every culture's heroes.