Board Thread:Questions and Answers/@comment-16461120-20160405223613/@comment-5001176-20160407200446

I'm gonna go ahead and say NO here, as well. Quicksilver sided with the Avengers, as did Scarlet Witch, when they both turned on Ultron. Hawkeye's motivational speech to Scarlet Witch notwithstanding, neither one was officially a member of the Avengers (yet) at that point, nor did Quicksilver make the transition from "allied with the Avengers" to "joining the Avengers", due to his death in Sokovia. Scarlet Witch later did actually join the Avengers, as seen in the movie's final scene. Quicksilver did not because he was dead.

I would also add that IMO, AnnabellRice is correct in that his role in the movie is sufficiently prominent that he remains a Featured Character - just not an Avenger.