I can definitely recommend some Batman ones! Not entirely sure how "essential" these are but these are the ones I got when I decided to try and get into the Batman comics. I have 2 I'd highly recommend and a couple others from when I decided to try and get into Batman comics and might not be as high quality but I still think are worth a read for various reasons.
The 2 I'd wholeheartedly recommend are:
- The Killing Joke: This is probably the one you'll always see listed. Alan Moore's take on the Joker, it's relentlessly grim and brilliantly written. Definitely pick this one up.
- The Dark Knight Returns: Frank Miller nailed this one. It's got an old Bruce Wayne taking the mantle of the Batman once again and taking on some old and new enemies despite his advancing age. I love the story (especially the ending), I love this comic's interpretation of Robin and there are some really striking panels but the artwork is a little odd and might take some getting used to. Still a cracking read.
As for the others, these might not be the best reads but as I said, I have a couple of reasons for picking them up and they might be worth a look.
- Year One: This is Frank Miller taking on the start of Batman's career, in contrast to The Dark Knight Returns. It's nowhere near as solid as The Dark Knight Returns but I bought them together and it was neat to read them back-to-back, if only for progression's sake.
- Year 100: This is a weird one. The story is super-grim and the writing's a little wonky but the interpretations of some of the key elements of the Batman mythos are very cool but it was the artwork that really drew me in. It's got this gnarled, almost goblin-like vision of Batman that caught my eye.
- Gotham by Gaslight: What if Batman fought Jack the Ripper in Victorian Gotham? Yeah, that's this story. Aside from the What If? factor, the artwork is lovely and the story is actually pretty solid. There is a second story included in the version of the book I picked up which isn't as strong, but it's still worth a read.
- Hush: Hush is one of my favourite Batman villains, so I had to get this. The artwork is absolutely perfect, definitely the best reason to read this one and the story, which involves a plethora of the Rogues Gallery and a guest spot for Superman, is actually well-written. Watch out for the ending though, it let me down a bit.
Finally, I want to recommend this one. It's actually a Superman story but it has a fantastic depiction of Batman in it so whatever. Superman: Red Son is another What If? scenario, but this time it's what if Superman landed in the Soviet Union and became their symbol instead of America's? The comic uses a lot of imagery based on Soviet propaganda in terms of style and presentation, a lot of heroes appear but with great tweaks to their characters and images and, as I said, the version of Batman here is marvelous. Though he only appears for a short segment of the book, it's probably the big stand out bit for me. Worth a read for sure.