General naughtiness:
* As mischievous as a monkey.
* As playful as a kitten.
* As sly as a fox.
* As mischievous as a gremlin.
Disobedient naughtiness:
* As unruly as a wild horse.
* As stubborn as a mule.
* As defiant as a storm.
Mischievous naughtiness:
* As tricky as a magician.
* As cunning as a spider.
* As mischievous as a sprite.
Rude or disrespectful naughtiness:
* As disrespectful as a troll.
* As insolent as a pirate.
* As rude as a spoiled brat.
It's important to choose the simile that best fits the specific context and the type of naughtiness you're describing.