Well, in the main canon, Batman doesn't usually have this kind of direct family - like relationship with Ace. So the fanfic is a divergence from the norm.
In the main canon, Batman's identity is mostly associated with being a lone vigilante. But in this fanfic, by adopting Ace, he becomes a father - figure, which changes the dynamics completely. This can lead to different storylines and character arcs that are not present in the traditional Batman stories.
Well, regular Batman fanfic tries to stay true to the tone and themes of the original Batman stories. It might explore different aspects of Batman's character, his past, or his future battles. On the other hand, 'batman mary sue fanfic' brings in a Mary Sue character. This character can be a real disruption. They might have abilities that don't fit in the Batman world, like being able to fly without any technology or explanation. And their presence often makes the story less about Batman's struggle and more about this Mary Sue's own journey, which is quite different from the essence of regular Batman fanfic.
In the canon, their relationship is often more of a cat - and - mouse game with some underlying attraction. But in fanfiction, it can be much more romantic. Fanfictions can have them in committed relationships right from the start. In the official stories, they have their own goals that often conflict, but in fan - made stories, love can be the main focus and they might work together towards a common goal related to their relationship, like protecting each other from their enemies.
One reason could be the exploration of Batman's softer side. When he adopts Ace, it shows his capacity for love and family outside of his crime - fighting duties. It gives a new dimension to his character.
In the original Batman and Robin concept, their focus is mainly on fighting crime and upholding justice in Gotham. However, in gay Batman and Robin fanfic, while they may still fight crime, the relationship between them becomes a central plot point. Their romantic or sexual connection might influence their decisions during battles, or how they approach other characters. For instance, they might be more cautious not to put each other in too much danger because of their love for each other. Also, the fanfic may explore different aspects of their personalities that are related to their relationship, like jealousy or possessiveness, which are not present in the original concept.
In traditional Batman stories, Batman is usually in control, a vigilante who decides when and how to fight crime. But in 'batman slave fanfiction', he may be in a submissive position, like being controlled by an external force or a set of rules. For example, in some fanfictions, he could be under the control of a new, more powerful villain who has enslaved him in some way.
Fanfiction often delves deeper into the emotional and psychological aspects of Batman's broken back. In the original comics, it may be more focused on the plot progression. In fanfiction, authors might explore how Batman's identity is affected. He might question his role as a hero more in fanfiction than in the comics. Also, relationships with other characters can be explored in more depth in fanfiction, like his relationship with the Bat-family or his enemies.
In 'Batman: Gotham by Gaslight', Batman himself is different. He doesn't have all the high - tech gadgets that he has in other graphic novels. He has to rely on his wits, his physical skills, and more rudimentary tools. His relationship with the people around him, like Commissioner Gordon, is also different. It's more of a relationship based on the social norms of the Victorian era. The themes explored in this graphic novel, such as the contrast between the upper and lower classes in Gotham at that time, are also distinct from other Batman graphic novels which usually focus more on modern - day issues like crime in a big city or the psychology of the villains.
Batman becomes more empathetic. He has to consider the feelings and needs of the young heroes. He can't just be the lone, brooding detective. For example, he might be more open to their ideas during a mission.
In terms of Batman's growth, in the harem fanfiction, his personal relationships force him to reevaluate his loner - hero approach. He starts to rely on the members of his harem for emotional support and different kinds of help. This is a big change from the original where he was more self - reliant and solitary in his crime - fighting journey.
Well, there are a significant number of canon Batman comics. It's a constantly evolving collection. Different story arcs and series contribute to the count, but it's difficult to provide a precise figure due to the ongoing nature of comic production.