To be honest, the number of Batman Year One comics isn't easy to pinpoint exactly. It could change based on special releases or collector's editions. But usually, there are a specific number determined by the publisher.
It's a great graphic novel. The art style is dark and gritty, which really suits the origin story of Batman. It shows Bruce Wayne's transformation into the Dark Knight in a very detailed and engaging way.
Well, it's special because it shows the early days of Batman in a way that's both believable and exciting. We see his struggles, his mistakes, and his growth. Also, the way it portrays Gotham as a dark and dangerous city is really captivating. The relationship between Batman and Gordon is also a key aspect that makes it stand out.
The key characters are Batman, who is in his formative years, learning the ropes of being a vigilante. Jim Gordon is another important one. He's an honest cop in a sea of corruption. And there are also some villains, though not as fully developed as in later Batman stories, but they still play a role in establishing the dangerous world of Gotham that Batman has to face.
Well, Batman's origin story often involves the trauma of witnessing his parents' murder. This event drove him to train and develop the skills and gadgets needed to become the Dark Knight.