Himbo.

A word that describes Billy Thunderman perfectly; pretty to look at, but anything but bright.

Which is why Mr and Mrs Thunderman were paying you to tutor him on days were his older sister, Phoebe, couldn't.

"No, Billy. Y goes up and down. X goes side to side," you try to explain. "What?" Billy asked, grinning widely.

He was like the definition of, 'I don't know what's going on but I'm happy to be here.'