Oh, I forgot about the cat sub-plot. He was always trying to catch and eat the family's cat, yet somehow was allowed to stay and still came off as loveable/funny. I actually watched ALF a bit in the 80's, at least that first season or two.
I'm just thrilled we could get some folks on record here defending ALF as an "immigrant" in the same mold as James Gunn's cheaper-than-hiring-an-American maid and Sean Gunn's cheaper-than-hiring-an-American gardener.
ALF, for gosh sakes! The mind boggles at the mental gymnastics required for that to make sense.