Stewie Griffin is an evil baby genius who is obssesed in world domination and matricide. His role in the ficticional series of Family Guy is of an antagonist and he is popularly considered the breakout character of the series. His distinct characteristics of being a baby and yet being an evil genius who read novels such as the GodFather and creates the most advanced techonology in order to complete his dream of world domination and the killing of Louis(his mom) are just brilliant. Another ironic trait is that even though he is so mature in many aspects, he still carries a babies' behavior, like for example pooing in his pants and breast feeding.
What makes Stewie so funny in my opinion is his swift change in characteristic; in one second he is playing with toys and in the other he is driving a plane or discussing with intellectuals. His interaction with the dog of the Griffin family, Brian is hilarious as well. As funny as it sounds the only one at the house who really knows him and talks with him is the dog. Their scenes together are definitely one of the reasons I enjoy seeing Family Guy.
Here are some quotes of Stewie Griffin: Stewie: How you uh, how you comin' on that novel you're working on? Huh? Gotta a big, uh, big stack of papers there? Gotta, gotta nice litte story you're working on there? Your big novel you've been working on for 3 years? Huh? Gotta, gotta compelling protaganist? Yeah? Gotta obstacle for him to overcome? Huh? Gotta story brewing there? Working on, working on that for quite some time? Huh? (voice getting higher pitched) Yea, talking about that 3 years ago. Been working on that the whole time? Nice little narrative? Beginning, middle, and end? Some friends become enemies, some enemies become friends? At the end your main character is richer from the experience? Yeah? Yeah? (voice returns to normal) No, no, you deserve some time off. ( Stewie is reffering to Brian's novel)
Meg (about Peter being retarded): I can never go to school again!Stewie: Oh, yes, Meg, yes-yes yes, everything was going swimmingly for you until this. Yes, yes, THIS is the thing that will ruin your reputation, not your years of grotesque appearance, or your awkward social graces, or that Felix Ungerish way you clear your sinuses, no no no, it's THIS. Do you hear yourself talk? I might kill you tonight.(http://www.familyguyquotes.com/characters/stewie-griffin-quotes.html )