Beware the Nice Ones: Mork may be a childlike jokester, but he is still an alien with limited telekinetic abilities, and can be a dangerous opponent when angered, as seen in "The Night They Raided Mind-ski's".
Innocent Aliens: The only times he's done something bad, it was out of simple naivete, and he's a very decent alien. Mindy even describes him as "the nicest alien [she's] ever met" (although she probably hasn't met any other aliens).
Mister Seahorse: He was the one to get pregnant, which is apparently unusual even for an Orkan.
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.
Straight Man: Not that she has much choice, being a normal girl who is good at remaining calm in front of Mork's antics.
Fred McConnell and Cora Hudson
Played by: Conrad Janis and Elizabeth Kerr
Advertised Extra: Averted in season 1 where they are regulars. However in season 3 and 4 Mindy's father is credited as a regular but doesn't appear in 16 episodes.
Cool Old Lady: Grandma Cora rides a motorcycle and prefers modern music to the classical which Mindy's father likes. Imagine an old lady who loved both rock music and Mork with his lovable silliness, even after she learned he is an alien.
Put on a Bus: They were absent for the second season, but Mr. McConnell returned.
In "The Wedding", when Mork announces his intentions to marry Mindy, Orson forbids him from doing so, because marriage has been outlawed on Ork. After Mork still goes through with the wedding, Orson turns Mork into a more obedient sheepdog, which results in Mindy confronting Orson, and Orson reluctantly consents, turning Mork back into his normal form.
Expy: It's pretty obvious with his name, voice and mannerisms as well as his implied girth that he's meant to be a parody of Orson Welles.
Cloud Cuckoo Lander: Possibly even more so than Mork. In his debut appearance, he calls Mindy (and later himself) "shoe" and thinks she's his father and Mork's his mother (although that might be because Mork laid his egg).
Meaningful Name: Mork says his name comes from his parents' shared first initial M, and "Earth." So Mork from Ork's son is Mearth from Earth.
Vague Age: He's only about one technically, but how that translates to Orkan aging is a mystery: he learned to walk and talk when he was only a few hours old but still wore diapers and there was no mention of him being potty trained at any point in the series. He's also attended school.