Don't Fry My Veeblax!
I Was a Sixth Grade Alien, Book 6
Written by Bruce Coville
from the back cover
When Percy, the mad poet, assigns Ms. Wietraubs class to write poems about their pets, Pleskit decides he should bring his Veeblax to school. Not a good idea! When the little shapeshifter frightens one of Pleskits classmates, she freaks out- and so do the newspapers. As the situation spins out of control, it becomes clear that Pleskit may lose his pet, his teacher may lose her job, and Earth may lose the benefits of alien connection. Running away may be the only way Pleskit can save the Veeblax. But where can you run to when you're the only purple kid on the planet? And what do you do when something very strange starts following you?