The little yellow school spaceship again: Caroline Luzzatto, Interplanetary Avenger. New York: Holiday House, 2005.
A school story. Sam is being bullied. He opens a package which allows an alien from another universe to enter his world. The alien is a shape changer. There are "hilarious" results.
I don't want to do this book down. It's funny. It's got lots of body parts. I enjoyed it.
But it's a school story about a boy learning to deal with bullying. And even the alien school is recogniseably an American alien shool.