Homer, Marge short for Margerie, Bart, short for Bartholomew, Lisa and Maggie, short for Margret and there's also thousands of guest stars and side characters.
--Homer, who is the guy with the beer belly and three strands of hair on his head; Marge, Homer's wife (she literally has tall blue hair); Bart, who is a troublemaker; Lisa, who is seriously intelligent and is branded as one of the geeks in school; and Maggie, the baby with the pacifier in her mouth.