No, Miwa didn't die in the manga.
Miwa remains alive throughout the manga. There's no indication or event that leads to Miwa's demise in the original comic.
No, Miwa didn't die in the JJK manga as of the latest chapters I know.
Miwa remains alive in the JJK manga. There are no events or plot developments that lead to her death. It's possible you might have misunderstood or there's a mix-up in your sources.
Sure did. Stain's death was a significant moment in the manga. It had an impact on the storyline and the characters around him.
No, Luffy didn't die in the manga. He's still going strong on his adventures.
No, Sanji didn't die. The character remains alive and plays an important role throughout the manga.
No, Deku doesn't die in the manga. The story continues with him as a central character.
Itadori did indeed die in the manga. His death had a significant impact on the story and the other characters. It was a turning point that led to many new developments in the plot.