Not Don Diego de la Vega
Not Dom Deluise
But… Yes, I am Arthur Dent
#5 explication - Arthur and the other characters died in the destruction of Earth at the end of the novel Mostly Harmless. Then Douglas Adams had a change of heart, deciding that ending was too bleak and the result of having a bad year. In the subsequent BBC radio adaptation, the ending was changed and a Babelfish teleported the main characters to safety just before Earth’s destruction. (Adams had already passed away by then)
Did you work for the PHB? - Yes, Dilbert and the Pointy-Haired boss
Is a key legal test of scientific evidence named after you? - Mr. Daubert: Daubert standard - Wikipedia
Did Roy Marsden play you for many years? - DCI Adam Dalglish, on British TV
On to N!
IQs:
Were you FDR’s first Vice President?
Did you earn the unwelcome nickname “Commissary”?
Did a weatherman say you made noises like a chipmunk when you got excited?