In the Marvel Comics, the Hulk does have children in some storylines. Specifically, he has two sons, Skaar and Hiro-Kala. Skaar is the son of the Hulk and an alien woman, while Hiro-Kala is a rogue child of the Hulk and Caiera the Oldstrong.
View page
I dont know but probably not. Ask whoever wrote him
View page
Hiro Hinata is the main character of the book Hiro's Quest