So you think it could be like http://garfieldminusgarfield.net/ ?
(Hell, Hobbes minus Calvin would be trippy enough, since Hobbes is the imaginary friend...)
The portion of Hobbes that is real is just an inanimate stuffed toy tiger. Hobbes as a motile, living, thinking being exists entirely as a figment in Calvin's mind, projected into the object of the toy tiger. So Hobbes the toy is real, while Hobbes the being is imaginary.