5. Bojack Horseman is an incredibly rich, middle-aged (horse)man. Bruce Wayne is an incredibly rich, middle-aged man. True, Batman’s age changes based on the incarnation and media, but he’s definitely not a teenager or young adult.
4. Batman has an off-and-off again relationship with Catwoman. Bojack Horseman used to date Princess Carolyn, a cat and his agent.
3. Bojack Horseman has a freeloading roommate named Todd Chavez. They annoy each other. Batman has to deal with Jason Todd, a former Robin and obnoxious current sorta-hero/antihero/jerkface.
2. Batman and Bojack Horseman are both voiced by Will Arnett.
1. Bojack Horseman and Batman both, judging from the teaser, have a history of loneliness and depression. On Bojack Horseman’s side, he’s alienated everyone around him with bad behavior, alcoholism, general rudeness, and an increasingly-desperate need to be noticed. As for Batman, his parents were killed when he was a child. Wouldn’t that still leave a mark, even decades after the fact?
Additionally, as shown in the teaser, Batman is incredibly lonely. A huge cave, filled with wonderful toys and mementos of past adventures, but no one to keep him company. Even Alfred is gone, probably sleeping by that point. To drive the point home further, both characters will have/have had arcs based around having other people to bolster your mood and help you in times of crisis. In the two seasons of Bojack Horseman, the eponymous horse slowly becomes kinder. His friends help him. He works out some of his issues. Meanwhile, the teaser for The Lego Batman Movie, along with a quick flash of the Lego Justice League, briefly mentions the importance of working with friends.
I made this article primarily as a joke, but the final scene in the trailer really seemed like something straight out of Bojack Horseman. Here, we see our protagonist, and in a funk. He heats up a meal in the microwave, insulting himself after accidentally setting the timer to two hours instead of two minutes. While eating the lobster, he despondently says, “I deserve this.” I can see Bojack doing something like that. I hope that The Lego Batman Movie is as intelligent as The Lego Movie. If not, I’ll still enjoy it, mostly because it looks hilarious.
The Lego Batman Movie comes out on February 10th, 2017. It is directed by Chris McKay and written by Seth Grahame-Smith. It stars Will Arnett as Batman, Ralph Fiennes as Alfred Pennyworth, Rosario Dawson as Batgirl, Michael Cera as Robin, Zach Galafianakis as the Joker, and Mariah Carey as the mayor of Gotham City.