Seth MacFarlane (character)

Seth MacFarlane is an actor, animator, filmmaker, singer and courthouse sketch artist who works in the federal court system.

History
When Marge became the Springfield courthouse sketch artist, people were so impressed with her work that they deliberately committed minor crimes in order to have her draw their pictures. Eager to get in on the trend, Krusty sold state secrets to North Korea so that Marge would draw his picture. To his dismay, however, Judge Snyder informed him that he had committed treason and his case would therefore be handled by a completely different court system.

In federal court, the sketch artist was Seth MacFarlane. In sharp contrast to Marge's realistic and moving sketches, MacFarlane drew a caricature of Krusty that looked like Stewie Griffin with Krusty's hair.

One of the attractions at Family Guy World is "MacFarlane Sings Sinatra".

Non-canon
Seth MacFarlane (the Quahog version) is in the rear right side of the courtroom during the trial of Duff Beer VS Pawtucket Patriot Ale.

Behind the Laughter
In the USA's legal system, is a federal offense and is prosecuted in federal court. Since Krusty committed treason and MacFarlane was the courthouse sketch artist, it therefore follows that MacFarlane works in the federal court system.