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Characterization Marches On/ Retcon: People who see Mork's original appearance on Happy Days after watching this series are likely to be shocked at what a Jerkass he originally was and that his appearance was said to have been All Just a Dream in that episode. Oddly enough All Just a Dream was a hurdle that another Happy Days spinoff (the long-forgotten Out of the Blue, which featured an angel as its protagonist) had to overcome as well.
My Species Doth Protest Too Much: Mork is chosen as Earth observer because his constant displays of humor make him out of place on Ork. This alienness only gets worse (and spreads to other areas) as Mork spends more time on Earth.
Nice Guy: Mork is mostly pacifistic, good with kids, and humorous.