While it is true that Attack on Titan contains some horror elements, such as the Titans themselves and the violence that they inflict, it is not the primary focus of the anime. The main focus of Attack on Titan is on the characters and their development as they try to survive in a world that is constantly under threat from the Titans.
The anime is also more of a drama because it explores themes of identity, loss, and the human condition. The characters in Attack on Titan are complex and well-developed, and their interactions with each other are often emotional and powerful. The anime also does a good job of building tension and suspense, and creating a sense of dread and uncertainty.
Attack on Titan is certainly not a comedy, but it is not all doom and gloom either. There are moments of humor and levity, as well as moments of hope and triumph. The anime is ultimately a story about the power of the human spirit, and how people can come together to overcome even the most difficult obstacles.