This story concept always seems fun to me, it's like those characters read or watch their own anime, but doing it as a top and that everyone can see it is very good. Now I want to try to predict what are the other 8 deaths that will appear.
Since I saw the title I knew that if One piece was in the story, the death of whitebeard would be the winner. It's quite obvious because One piece almost never kills characters, it shows how characters who were already dead like Roger died but it's very rare that he kills them in the present line.
If bleach is there, it means it has to be Yamamoto's death, maybe Ulquiorra but the former is more likely.
In Naruto Jiraiya wins on the street, but if it doesn't matter to show deaths that have already occurred according to the time line, the death of minato and kushina is a tough contender, even the death of kakashi despite being resurrected.
Dragon ball is difficult, if you don't count characters that resurrect, it means that iconic deaths like Krillin's in namek and Vegeta's against majin buu don't count, if you don't count pre-canon deaths either, it means Bardock's death doesn't count either. That leaves me with the only logical conclusion, Future Gohan's death.
