The extent to which Stewie Griffin can be considered the funniest character on Family Guy is a matter of personal opinion and humor preference. The show features a wide range of humorous characters and comedic moments, and the subjective evaluations of what makes something funny can vary among different individuals.
Stewie Griffin's character is a significant element in the humor of Family Guy. His interactions with other characters, his outrageous schemes and aspirations, and his darkly comedic observations contribute to the show's overall humor.
However, the perception of how funny Stewie is in comparison to other characters in Family Guy, such as Peter, Lois, Chris, Meg, Brian, and others, can vary among different viewers. Each character in the series has their own distinct comedic attributes, and individual preferences may lead to different opinions about who the funniest character is.
It is worth noting that the humor of Family Guy tends to be crude, offensive, and often pushes boundaries of political correctness and social taboo, which may affect how some viewers perceive the show's humor and characters.