Allen doesn't die. The creators of Invincible comics have kept him alive to drive the story forward and engage the readers with his ongoing adventures.
Well, there could be an epic battle. Maybe the Justice League is facing a powerful enemy and Barry Allen, with his super - speed, arrives just in time to turn the tide. He could use his speed to disrupt the enemy's attacks and create opportunities for the other members of the Justice League to strike.
Perhaps they start off as rivals at first. Bruce might be a bit suspicious of Barry's powers and his more light - hearted approach. But as they get to know each other better, they realize they can learn a great deal from one another. Barry could teach Bruce to loosen up a bit, while Bruce could show Barry how to be more strategic in his superhero work.
One possible aspect of an early fanfic where Allen meets Neah could be the exploration of their complex relationship. Maybe it delves into how Allen initially reacts to Neah's presence, whether with suspicion or a strange sense of familiarity.
The Reverse - Flash could be a great main villain. He has a long - standing feud with Barry Allen and his presence would force Barry to team up with the Justice League. The Reverse - Flash's ability to manipulate time in his own way could pose a huge threat not just to Barry but also to the entire Justice League.
Well, in the fanfic, Allen might have a very intense encounter with the 14th. Maybe there would be a battle of wills between them, as Allen tries to resist the influence of the 14th. It could also involve some revelations about Allen's past or the nature of his Innocence that are related to the 14th.
One idea is that Barry discovers a time - related threat that has the potential to erase Bruce Wayne's past, which in turn would change the present Gotham City. They have to race against time (literally for Barry) to stop this threat. Another could be that a meta - human is stealing high - tech equipment from Wayne Enterprises and using it for evil purposes. Barry and Bruce work together to track down this meta - human and retrieve the stolen tech.
Sorry, I haven't actually read this specific fanfic, so I can't give a definite summary. But generally, it should be about Allen's encounter with the 14th, which might include some kind of conflict or discovery.
Perhaps Allen and Neah would have an intense verbal exchange. Allen might question Neah's intentions right away, given Neah's somewhat mysterious nature in the D Gray - Man series.
Allen in these fanfictions is typically a complex character. He has his own goals related to the Millennium Earl and the Akuma, but his feelings for Lenalee add another layer to his personality. He might be hesitant in expressing his emotions at times. Lenalee, on the other hand, is very empathetic. She is able to sense Allen's pain and tries to ease it. Their relationship in the fanfiction is usually based on mutual understanding and a growing, unspoken love that gives both of them something to fight for.