Side characters in The Adventures of Liam the Leprechaun
Passion Fruit's final wish in the episode Passion's World Peace was for a unicorn. This particular unicorn happened to be evil, and ran off with Liam's pot o' gold. He later appeared in Lousy Limericks as part of Liam's promotion from "an incompetent leprechaun to a horse's ass". He was mentioned in Misfortune Teller.
A gypsy who found Liam's pot o' gold, but showed no interest in it until he said it was bottomless. Forced to grant her three wishes, Liam confused the first two (as usual), giving her a basketball and a leprechaun-sized hula hoop. Her final wish was to be able to see into the future, which Liam surprising was able to do - a little too well, in fact, because shortly after, his pot o' gold was stolen by Clover.
The robot from Robot and Me, another series created by Bobjenz. This character was shown in Blast the Annoying Orange! Leprechaun Gets His Own YouTube Channel!, but never made a full appearance.
A genie (or other sufficiently mystic entity) with a laptop. This character was shown in Blast the Annoying Orange! Leprechaun Gets His Own YouTube Channel!, but never made a full appearance.