Quaestor was member, with substantial authority, in the Q Continuum. Considered as "the voice of the continuum" by a young version of Q. Along with Quinn, Q2, and Lady Q, he fought against 0 and his compatriots while Q stood on the sidelines and watched.

When Q took Captain Jean-Luc Picard on a tour of his past to explain what dangers were lying beyond the Galactic barrier, Picard saw Quaestor and noted that he had a striking resemblance to himself, as well as sounding similar. Picard wasn't sure if this was intentional on the part of Q and suggested that Q always viewed Picard as a sign of authority. (TNG novel: Q-Strike)