In such a fanfiction, perhaps Luffy would convince Nami to join his crew much sooner. They might start their adventure earlier, exploring uncharted islands together. Maybe they would form a stronger bond right from the start, sharing their dreams more openly.
In this fanfiction, an interesting plot point might be that Nami's past with Arlong is revealed to Luffy earlier. This could lead to Luffy taking on Arlong much sooner in the story, changing the whole sequence of events. Also, their early meeting could mean that Nami is more confident in Luffy's leadership from the start, and they might recruit other crew members in a different order. For example, they could meet Usopp earlier because of their different exploration routes due to the early bond between Luffy and Nami.
Several characters have met their demise in the MHA manga, but it's a bit complex to list them all precisely. Some of the notable ones include [mention specific characters if known].
I think it's hard to say for sure. There are a few characters who could potentially be the traitor, and it's all part of the mystery and suspense of the story.
I'm not entirely sure specifically as it could vary a great deal. 'MHA' might refer to 'My Hero Academia'. A 'fanfic' is a fan - created fiction. However, the 'diaper' part makes it rather odd and it could potentially be some sort of very strange or niche fan - created story within the My Hero Academia universe that involves diapers in some way, perhaps in a comical or very out - of - the - box scenario.
It depends on the specific situation and the character's personality. Some heroes might have moments of fear but overcome them through their determination and sense of duty.