Q2 continued to follow Human-Q's progress aboard the USS Enterprise-D. He later appeared and re-instated Human-Q's powers when the latter Q committed a selfless act to save the Enterprise-D from the attacking Calamarain. (TNG: "Deja Q")
As far as non-canon appearances, Q2 was featured in the Q Continuum trilogy by Greg Cox participating, along with Quinn and the female Q in the war against "0" in the Continuum trilogy. He was briefly featured in the Peter David novel Q-in-Law, but played a more vital role in David & de Lancie's I, Q as a supposed ally of Q's in his struggle to stop the end of the universe.