Rabo Karabekian is a fictional character and the narrator and protagonist of the 1987 novel "Bluebeard" by American author Kurt Vonnegut, Jr.
Viper (real name Ophelia Sarkissian, formerly known as Madame Hydra) is a fictional supervillain appearing in American comic books published by Marvel Comics.
 She is a foe of the Avengers and the X-Men.
Karnig Sarkissian (Armenian: Գառնիկ Սարգիսեան ), is a popular Armenian singer born in Aleppo, Syria, and a naturalized American citizen.
 He is well known for his Armenian patriotic songs throughout the Armenian diaspora and a big supporter of the Armenian Revolutionary Federation (ARF).
Bluebeard, the Autobiography of Rabo Karabekian (1916–1988) is a 1987 novel by best-selling author Kurt Vonnegut.
 It is told as a first person narrative and describes the late years of fictional Abstract Expressionist painter Rabo Karabekian, who first appeared, rather briefly, in "Breakfast of Champions".
 Circumstances of the novel bear rough resemblance to the fairy tale of Bluebeard popularized by Charles Perrault.
 Karabekian mentions this relationship once in the novel.

Question: Who is fictional, Rabo Karabekian or Karnig Sarkissian, or both?
Answer: Rabo Karabekian