Stewie Griffin is portrayed as a one-year-old
prodigy who has a sophisticated voice, American football-shaped head, and can speak very fluently in an
upper-class British accent with quite-advanced vocabulary. He reaches his first birthday in the
season 1 episode "
Chitty Chitty Death Bang", and the family celebrates Stewie's birthday in a cutaway
gag in the
season 12 episode "
Chap Stewie". As Stewie's first birthday was celebrated in the episode "Chitty Chitty Death Bang", it is safe to assume that it was Stewie's second first birthday in the episode "Chap Stewie". Very highly literate and able to cite
pop culture references that long predate his birth, Stewie is also entranced by
Raffi and
Teletubbies. Stewie succumbs to other childish tendencies; he believes Peter has truly disappeared in a game of
peekaboo, often has difficulties understanding the concept of
shapes, talks to his
teddy bear Rupert as if he were alive, is overcome with laughter when
Lois blows on his stomach; and has no idea how to use a toilet. as well as an assortment of weapons including lasers, rocket launchers, and crossbows. Stewie employs these to cope with the perceived stresses of infant life (such as
teething pain and eating broccoli) and to murder his mother, Lois, with mixed success at best depending on the objective. As made clear in
the pilot episode, Stewie's matricidal tendencies are a result of Lois constantly and unwittingly thwarting his schemes, and so he desires to kill her to carry out his plans without her interference. In other, later episodes, Stewie engages in other violent and criminal acts, including
robbery,
aggravated assault,
carjacking,
loan sharking,
forgery, and killing off many minor characters (with a tank, guns, and other assorted weaponry). Stewie eventually realizes his dreams of
matricide and world domination in the sixth season two-part episode "
Stewie Kills Lois" and "
Lois Kills Stewie". The events are
reverted in a
deus ex machina ending, where most of the story turns out to be a
computer simulation. Because of the rather disastrous ending for himself in the simulation, being shot and killed by Peter, he decides to put aside his outlandish plans of
matricide and world domination for the time being. Stewie shows a complete disdain for most people, especially
Matthew McConaughey, but does show affection and even rare instances of kindness to his family. Such moments include his support for Meg (whom he traditionally calls "Megan") as when he chided Brian's
coke-induced hostility to her ("
The Thin White Line"), retracted his joke, "I hate you too, bitch" when Meg said "I hate you all" to the family ("
Untitled Griffin Family History"), told his parents to stop their gross negativism on Meg's attempt at cooking and give her a chance ("
Trading Places"), and wiped her tears during a weepy moment. On a more frequent basis though, Stewie constantly disrespects Meg, as he does with most elders (and as most people do to Meg), often being rude to her and subjecting her to the malice of his misbehavior, once even tricking her outside to be attacked by bees on steroids. He generally thinks of Peter as an inferior—regarding him simply as "the fat man" and, at one point, harboring doubts that Peter could be his father ("
Stewie Griffin: The Untold Story")—but does bond with him over a shared love of practical jokes made at Lois' expense ("
The Courtship of Stewie's Father"). While Stewie typically regards Chris as a stooge, he considers him his only friend aside from Brian and even helped Chris to dress when he felt too shy to date ("
Extra Large Medium") and assists him in dealing with bullies ("
Secondhand Spoke"). In a few episodes, such as "
Stewie Loves Lois", it is shown that Stewie can love his mother. In that episode, after Lois recovers and repairs a lost Rupert and serves Stewie a meal he likes, he rethinks Lois and accepts her as a loving mother. When he becomes too dependent on her, she deliberately takes no notice of him; when he hurts himself, she tries to show notice of him again, and he returns to hating her. However, at the end of the season nine premiere, "
And Then There Were Fewer", when Diane Simmons is about to murder Lois for uncovering her murderous revenge scheme, Stewie secretly saves Lois by killing Diane with a sniper rifle, though he states to himself that he only did it to not miss out on the opportunity to kill Lois in the future. Starting around
season 8, Stewie starts to have a larger amount of freedom from his parents, usually spending much of his time with
Brian. This extends to the point of his ability to keep pigs from parallel universes ("
Road to the Multiverse") or take part in the television series
Jolly Farm ("
Go Stewie Go"), as compared to the first season, in which his plans were constantly hindered by
Lois. In "
The Hand That Rocks the Wheelchair", Stewie inadvertently clones an evil twin of himself after trying to increase his evil nature. By the end of the episode, original Stewie and evil Stewie look exactly the same, and to differentiate the two, Brian asks both to look at their feet, leading one of the twins to laugh (likely original Stewie, who typically laughs when staring at his feet) and the other twin to ask why he needed to look at his feet; seconds later, Brian shoots and kills one of the twins. It is possible that the original Stewie may have been unknowingly killed by Brian (since he cannot tell them apart) as Stewie turns to the camera with glowing yellow eyes (reminiscent of
Michael Jackson's "
Thriller") at the end of the episode, but this isn't referenced in later episodes, indicating that Brian very likely killed Stewie's evil twin and the yellow eyes were simply a gag. Stewie also starts to interact with more people despite still having hatred towards many of them, as shown in cutaways in later episodes and is more flamboyant. Stewie is to be a superfan of
Taylor Swift and even sets her up with Chris as a prom date. Stewie has had a few rare interactions with his
pedophile elderly neighbor
Herbert. Stewie intensely dislikes him and is one of the few characters fully aware of Herbert's nature, even calling him a pervert to his face. All this does, however, is move Herbert into thinking Stewie is "feisty". In the
season 16 episode "
Send in Stewie, Please", it is revealed that Stewie's English accent is fake and that he has an American accent, although the follow-up joke that has him speak in numerous other voices (of Seth MacFarlane's other characters) suggests it was a mere gag. ==Development==