One possible storyline could be exploring the immediate aftermath of Bruce's death. How does Terry McGinnis handle the loss? Another could be flashbacks to Bruce's final days, showing his last words of wisdom to Terry.
Bruce Wayne's death in Batman Beyond was a natural consequence of his life's journey. He had been Batman for a very long time, facing all kinds of challenges. His body had been through numerous injuries and his mind had been burdened with the weight of protecting Gotham. Over time, these factors combined with the natural aging process. His heart, which had pumped blood through his battle - worn body for so many years, finally stopped, and he passed away, but his spirit lived on in the new Batman, Terry McGinnis.
Sure was. Batman Beyond was indeed a comic that explored the adventures of a new Batman in a dystopian future. It had unique storylines and art styles that attracted many fans.
Another possibility is that Bruce is making moral decisions in the fanfic that Alfred doesn't agree with. As Alfred has his own set of values and he has been around Bruce for a long time, if Bruce starts to cross certain ethical lines in the name of justice, Alfred would be disappointed.
A really cool 'Batman Beyond' fanfiction is 'Future of Gotham'. This one takes a look at the future of Gotham City itself, with Terry as Batman facing threats that could change the city forever. It has a unique take on the technology in the 'Batman Beyond' universe.
One of the best is 'Return of the Joker'. It delved deep into the complex relationship between Batman and the Joker, even in this futuristic setting. It was dark, full of twists, and really explored the legacy of the original Batman - Joker dynamic.
There's no fixed number of Batman Beyond comics. It's a constantly evolving field. Different story arcs and special editions contribute to the total, making it difficult to provide a precise count.