Why is harold gay

And as author and illustrator Dav Pilkey quietly reveals, Harold is a gay character. "Soon, everyone had gathered together in Old George's studio," the passage read.

Yes, they added a few diverse things such as Harold being gay (which is totally confirmed).

Captain Underpants and the Sensational Saga of Sir Stinks-A-Lot revealed the co-protagonist, Harold, to be gay. LGBTQ+ news reporter Steven Frank, from Logo News, commended the unostentatious nature of the book's gay representation, deeming the move a "big step forward for kid's lit." [2].

While both characters turn out to be married with kids, “Old Harold” just so happens to be married to another dude — and this is actually explained in the narration and depicted in author.