Focus on Appearance:
* As pale as a sheet, with eyes like dead coals.
* As stiff and lifeless as a wooden doll.
* As rotten and decaying as a fallen fruit.
* As gray and withered as a forgotten photograph.
Focus on Movement:
* Moving as slow and deliberate as a glacier.
* Shambling along like a broken marionette.
* As relentless as a tide, crashing over everything in their path.
* As unpredictable as a swarm of locusts.
Focus on Hunger:
* As ravenous as a starving wolf.
* As insatiable as a bottomless pit.
* With a hunger that burns like a raging fire.
Focus on Lack of Humanity:
* As emotionless as a stone statue.
* As hollow and empty as a discarded shell.
* As soulless as a vacant building.
* As cold and heartless as a winter wind.
Humorous Similes:
* As enthusiastic about brains as a kid with a new toy.
* As graceful as a bull in a china shop.
* As coordinated as a drunk juggling flaming torches.
Remember: The best simile depends on the context and the specific type of zombie you're describing. Be creative and have fun with it!