  Nonstandard parafermions are built and their central charges and dimensions
are calculated. We then construct new N=2 superconformal field theories by
tensoring the parafermions with a free boson. We study the spectrum and modular
transformations of these theories. Superstring and heterotic strings in four
dimensions are then obtained by tensoring the new superconformal field theories
along with some minimal models. The generations and antigenerations are
studied. We give an example of the $1^2(5,7)$ theory which is shown to have
three net generations.
