Huddled like refugees from another time and place, a family appears in the theater clad in mourning black, an orphaned band of dramatis personae. They have interrupted the rehearsal of a play, but the piece isn’t much to speak of. “France won’t send us any good plays,” complains the director, a commanding and elegant man who surely deserves better. “We are reduced to staging works by Pirandello. To those who understand them, bravo.” Well, good news: The director, his ensemble and the strange new arrivals are all trapped inside Luigi Pirandello’s “Six Characters in Search of an Author,” and comprehending it is no problem in Emmanuel Demarcy-Mota’s lucid, fast-moving, shadow-filled production at the Brooklyn Academy of Music. The Paris company Théâtre de la Ville, last seen at the academy two years ago in Mr. Demarcy-Mota’s staging of Ionesco’s Rhinoceros, is back at the Next Wave Festival.