Stewart Gilligan "Stewie" Griffin is a main character and antagonist/anti-hero of the animated series Family Guy voiced by Seth MacFarlane. Once obsessed with world domination and matricide, Stewie is the youngest child of Peter and Lois Griffin. His older siblings are Chris and Meg.
Though he was originally an evil child-genius bent on world domination, the writers in more recent episodes usually ignore that aspect of his personality, instead focusing on a more flamboyant and eccentric character. Stewie is considered to be the show's breakout character. Wizard magazine rated him the 95th greatest villain of all time.
Stewie is a 1-year-old who talks with an English accent and has a very sophisticated psyche. and has no idea how to use a toilet. MacFarlane has stated that Stewie is meant to represent the general helplessness of an infant through the eyes of an adult. Per cartoon physics, his ability to move objects of greater weight than himself is not surprising to other characters, nor is his ability to retrieve firearms from hammerspace.
Stewie's mastery of physics and mechanical engineering are at a level of science fiction. He has constructed advanced fighter-jets, a mind control device, a weather control device, a teleportation device, robot, clones, a working Transporter device from Star Trek, time machines, a Multiverse Transporter (from Episode: Road to the Multiverse), a shrinking pod, as well as an assortment of guns including lasers, rocket launchers, and crossbows. Stewie employs these to cope with the 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 interference.
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Official Site: 20th Century Fox Television
Links: Stewie Griffin's Wikipedia page "Family Guy" Wikipedia page "Family Guy" imdb page