Blackbeard's crew is also a diverse bunch. His more aggressive members like Burgess might be eager to start a fight with Luffy's crew. However, some of the more cunning members could be thinking of ways to use the situation to their advantage. They might try to manipulate Luffy or his crew into making mistakes. And if Blackbeard decides on a certain course of action, his crew would generally follow, but there could be some internal dissent depending on the situation.
In some 'Death Ace' Harry Potter fanfictions, 'Death Ace' might be a new villain. This character could be creating chaos in the wizarding world in a different way than Voldemort did. For example, instead of focusing on pure - blood supremacy, they might be after a powerful magical artifact that could change the balance of power in the wizarding world. Their actions would then force Harry and his friends to face new challenges and use different strategies to stop them.
Fanfiction writers often play with the idea of unfulfilled dreams or destinies. Ace and Sabo had so much more they could have done. So, in some fanfics, their memories are so strong that they exist as a sort of spiritual force. And this force is then able to influence events in a way that leads to their physical resurrection. For example, their memories might guide Luffy to a place where he can find the means to bring them back.
Luffy would be really emotional. He might laugh at the funny parts of Ace's past and cry at the sad ones. He loves his brother so much that any story about Ace would have a big impact on him.
One possible storyline could be that Ace's death shatters the crew's morale, and Whitebeard, in his attempt to avenge Ace, faces an overwhelming enemy. In the fanfiction, Whitebeard might use his last bit of strength to protect the remaining crew members, leading to his own death. Maybe there could be a flashback of their relationship, how Ace was like a son to Whitebeard and how that bond drove Whitebeard to fight to the end.
The world would be in shock. The media would be filled with reports of his death. Civilians who had always seen him as a symbol of safety would feel vulnerable. There would be mass mourning in the cities he had protected.
Ryuk would probably just be amused. He is a Shinigami who has seen a lot in his existence. Fanfiction is just another strange human creation to him. He might chuckle at some of the more outlandish ideas in the fanfictions, like a character having superpowers beyond the Death Note.
Harry would likely be devastated. He has always been in the spotlight, whether he liked it or not. Now, being ignored, he'd feel like he's in a different world. He might start to isolate himself even more, thinking that he's better off alone. However, he also has a strong sense of justice. So, he'd start to investigate. He'd look for any signs or clues as to why everyone is ignoring him. He might even suspect some dark magic at play. As he digs deeper, he could become more self - reliant and less trusting of those around him until he figures out the truth.
He might be initially shocked and heartbroken. Naruto has always valued his friends and the village's trust, so when that's suddenly taken away, he's in disbelief. He could try to reason with his friends at first, but when they don't listen, he might become angry and determined to prove his innocence on his own.