In the realm of fictional scenarios involving zombies, katanas are often depicted as effective weapons due to their sharpness, maneuverability, and cutting ability. Here are a few reasons why katanas are sometimes considered suitable for combating zombies in fictional settings:

1. Sharpness: Katanas are known for their sharp and finely crafted blades, allowing them to cut through various materials, including fictional zombie flesh.
2. Lightweight and Maneuverable: Katanas are typically lightweight and well-balanced, making them easy to wield and maneuver. This can be advantageous when dealing with multiple targets or swift, close-quarters combat situations.
3. Single-Handed Use: Katanas are traditionally designed to be wielded with one hand, allowing the wielder to have better control and the option to use their other hand for additional tasks or defense.
4. Cutting Ability: The curved blade of a katana lends itself well to slicing and slashing motions, which can be effective against softer targets like fictional zombies.

However, it's essential to remember that zombies are fictional constructs, and their weaknesses and behaviors vary depending on the specific fictional universe. In reality, the effectiveness of any weapon, including a katana, against real-world threats is determined by various factors such as training, skill, and the specific circumstances at hand.

Additionally, when considering self-defense or emergency situations, it's important to prioritize personal safety and adhere to legal and ethical considerations. Consulting with experts in self-defense and adhering to local laws and regulations is crucial when making decisions about appropriate self-defense tools or strategies.