Question: Which Greek-American actor portrayed a fictional character on NBC's Days of Our Lives?

Context paragraphs:
Taylor Walker (Days of Our Lives): Taylor Walker is a fictional character from the American NBC soap opera, "Days of Our Lives", a long-running series about working-class life in the fictional town of Salem.  She was introduced in 1998 by head writer Sally Sussman Morina, and executive producer Ken Corday by actress Katherine Ellis.  The character was reintroduced in 2011, by former "General Hospital" actresses Natalia Livingston and Tamara Braun, the latter of whom also portrayed the character of Ava Vitali on the same show.  The character of Taylor Walker's last appearance was on September 22, 2011.

Madison James: Madison James is a fictional character from the NBC Daytime soap opera, "Days of Our Lives", created by head-writers Marlene Clark Poulter and Darrell Ray Thomas, Jr..  She was portrayed by actress Sarah Joy Brown, who made her onscreen debut on the episode that aired October 4, 2011.  Madison is introduced into the series as the headstrong CEO of Mad World Cosmetics and as a potential love interest for Brady Black (Eric Martsolf).  She is also a longtime competitor and rival against series veteran Kate Roberts (Lauren Koslow) and her resurrection of Countess Wilhelmina.  Originally introduced with an unknown past, the pre-Salem secrets of Madison's life begin to become exposed as she continues to live her life in Salem.  In April 2012, it was announced that Brown was let go from "Days of our Lives", and Madison last appeared on August 15, 2012.

John Black (Days of Our Lives): John Black is a fictional character from "Days of Our Lives", an American soap opera on the NBC network.  He has been played by actor Drake Hogestyn since 1986, with a break in between from January 2009 to September 2011.  John was created by script writers Sheri Anderson, Thom Racina and Leah Laiman as The Pawn in 1985 and introduced by executive producers Betty Corday and Al Rabin.  John becomes one of "Days of Our Lives' " most popular characters when he is revealed to be the presumed dead Roman Brady (Wayne Northrop) with plastic surgery and amnesia.  However, Northrop's return in 1991 led to Hogestyn's Roman being retconned into the entirely separate character of John Black, which also establishes the supercouple pairing of John and Marlena, due to John's affair with Roman's wife, Marlena Evans (Deidre Hall).  During the time in which he believes he is Roman, John picks up the mantle of Roman's feud with the notorious international criminal Stefano DiMera (Joseph Mascolo).  John and Stefano's feud is central to the character's history as Stefano is partly responsible for John's memory loss.  Their lives are further intertwined in 2008 when the two are falsely led to believe they are half brothers—a story that was later disproved.  Hogestyn's portrayal has made him one of daytime's most popular and recognizable stars.  Hogestyn was attributed with helping the series out of its ratings slump in the 1980s.  He was often featured in soap opera magazines such as "Soap Opera Digest" and "Soap Opera Weekly".

Kayla Brady: Kayla Brady is a fictional character on the NBC daytime soap opera "Days of Our Lives".  She made her first appearance in 1982.  Kayla was created by Pat Falken Smith as one of the original members of the Brady family, a fictional family on the serial.  She is widely known for her popular pairing with Steve Johnson.  This relationship gave the couple the title of a famous super couple.  Kayla was described as being the "good" girl of the serial.  During her time on "Days of our Lives", Kayla was extremely well received by television critics.  Kayla Brady Johnson is one of the six Brady children.  She is the daughter of the late Shawn Brady and Caroline Brady.  She is the sister of Roman and Kimberly Brady, the half-sister of Bo Brady, and the sister of adopted brothers Frankie and Max Brady.  She has been married three times, to Jack Deveraux and twice to Steve Johnson.  Steve and Kayla have two children, a daughter, Stephanie, and a son, Joey.  Mary Beth Evans returned to "Days of Our Lives" for a short-stint on June 18, 2010, and then again on recurring status starting in December 2011.

Victor Kiriakis: Victor Kiriakis is a fictional character on NBC's "Days of Our Lives".  The role has been portrayed by John Aniston since 1985.  His time on the show has been since 1985 with a brief storyline driven absence in 2004 when his character was "killed off" but found alive on the island of Melaswen.

EJ DiMera: EJ DiMera is a fictional character from the original NBC Daytime soap opera, "Days of Our Lives", portrayed by James Scott.  Originally portrayed by child actors, Avalon, Dillon and Vincent Ragone from 1997 to April 1998, the character was rapidly aged in 2006 as Scott took over the role of the adult EJ.  Scott departed the role on-screen in October 2014, resulting in the character's on-screen death.

Chloe Lane: Chloe Lane is a fictional character from the American NBC soap opera "Days of Our Lives", portrayed by actress and singer Nadia Bjorlin.  She was first introduced in November 1999, created by then-head writer Tom Langan.  Bjorlin played Chloe nearly continuously from 1999 through 2005, and from 2007 until 2011, when she decided not to renew her contract with the soap.  Bjorlin announced during an interview with "TV Guide" that she would return to "Days of our Lives" once again.  She made her return on January 7, 2013, and remained until April 16, 2013.  Bjorlin returned to the role, in a two-episode stint in celebration of the soap's fiftieth anniversary celebration on August 3, 2015.  She returned for another visit in January 2016 and returned full-term in June 2016.

John Aniston: John Anthony Aniston (born Giannis Anastasakis; Greek: Γιάννης Αναστασάκης; July 24, 1933) is a Greek-American actor.  He is best known for his role as Victor Kiriakis on the NBC daytime drama series "Days of Our Lives", which he originated in July 1985 and has played continually since then.  He is the father of actress Jennifer Aniston.

Kristen DiMera: Kristen DiMera is a fictional character from the American NBC Daytime soap opera "Days of Our Lives", portrayed by Eileen Davidson.  Davidson joined the cast of "Days of Our Lives" in 1993, and departed in 1998 after a five-year stint.  After a 14-year absence, Davidson returned to the role of Kristen in the fall of 2012.  Kristen and her brother Peter were raised but not legally adopted by super villain Stefano DiMera at a very young age following the deaths of their parents; however, their mother Rachel was later revealed to be alive.  Davidson's performance has been met with critical acclaim, having earned herself Daytime Emmy Awards and Soap Opera Digest Awards wins and nominations.  Davidson departed the series again in 2013, returning on July 28, 2014, for a twelve-week stint which concluded on November 6, 2014.  Kristen returned once again for another stint that ran from April 14, 2015, to April 30, 2015.

Robert DiMera: EJ DiMera is a fictional character from the original NBC Daytime soap opera, "Days of Our Lives", portrayed by James Scott.  Originally portrayed by child actors, Avalon, Dillon and Vincent Ragone from 1997 to April 1998, the character was rapidly aged in 2006 as Scott took over the role of the adult EJ.  Scott departed the role on-screen in October 2014, resulting in the character's on-screen death.

Supporting paragraphs: Victor Kiriakis John Aniston
Answer: John Aniston