Question: Who is the coward character who plays appears in one of Shakespeare's lesser-regarded works that has been adapted for the opera on several occasions?

Context articles: This Happy Breed
The Merry Wives of Windsor
Marianna Efstratiou
Karen Foo Kune
Ancient Pistol
Oh, Coward!
Danny Romalotti
ASC Jeanne d'Arc in African football
ASC Diaraf in African football
The Disappointment (Aphra Behn)

This Happy Breed is a play by Noël Coward.
 It was written in 1939 but, because of the outbreak of World War II, it was not staged until 1942, when it was performed on alternating nights with another Coward play, "Present Laughter".
 The two plays later alternated with Coward's "Blithe Spirit".
 The title, a reference to the English people, is a phrase from John of Gaunt's monologue in Act II, Scene 1 of William Shakespeare's "Richard II".
The Merry Wives of Windsor is a comedy by William Shakespeare first published in 1602, though believed to have been written in or before 1597.
 The Windsor of the play's title is a reference to the town of Windsor, also the location of Windsor Castle, in Berkshire, England, and though nominally set in the reign of Henry IV, the play makes no pretence to exist outside contemporary Elizabethan era English middle class life.
 It features the character Sir John Falstaff, the fat knight who had previously been featured in "Henry IV, Part 1" and "Part 2".
 It has been adapted for the opera on several occasions.
 The play is one of Shakespeare's lesser-regarded works among literary critics.
Maria-Anastasia (Marianna) Efstratiou (Greek: Μαριάννα Ευστρατίου ) (born 17 April 1955 in Athens) is a Greek singer, connected on several occasions with the Eurovision Song Contest.
 In 1987, she appeared as a backing singer for the duo Bang.
 Efstratiou won the Greek national song contest in 1989, overcoming Greek superstar Anna Vissi, and represented Greece in Lausanne with "To Diko Sou Asteri".
 The song was placed ninth.
 In 1996, ERT selected her to represent Greece again, this time with the song "Emis forame to himona anixiatika", but the song could only manage 14th place in Oslo.
 Efstratiou sang a number of songs in the semi-finals of the Greek national contest in 1998, none of which won.
 She has worked with Mimmis Plessas and she also starred on stage on several occasions.
 She has published two records and a promo cd single.
 On her debut album there's her cover of "Twist in My Sobriety", originally sung by Tanita Tikaram.
 She has also participated in the theatrical play "Pornography" by Manos Hatzidakis.
 Currently, she is the lead singer of the jazz ensemble Nova Mood.
Eileen Karen Lee Chin Foo Kune, born 29 May 1982 is a Mauritian amateur Badminton player, two times Mauritian Sportswoman of the Year (2004, 2009), ranked first in the African continent on several occasions.
 She once participated at the Olympic Games (2008) and made it to the Commonwealth Games on several occasions (2002, 2006, 2010).
Ancient Pistol is a swaggering soldier who appears in three plays by William Shakespeare.
 Though full of grandiose boasts about his prowess, he is essentially a coward.
 The character is introduced in "Henry IV, Part 2" and reappears in "The Merry Wives of Windsor" and "Henry V".
Oh, Coward!
 is a musical revue in two acts devised by Roderick Cook and containing music and lyrics by Noël Coward.
 The revue consists of two men and one woman in formal dress, performing songs based on the following themes: England, family album, travel, theatre, love and women.
 There are also sketches, such as "London Pastoral" which tells of the joys of London in the spring, "Family Album" about relatives who "were not excessively bright", and a scene with excerpts from several of Coward's plays, such as "Private Lives".
Danny Romalotti is a fictional character from the CBS soap opera "The Young and the Restless", portrayed by Michael Damian.
 The character of Danny first appeared in Genoa City, the town where "Y&R" is set, in 1980.
 Damian and his character Danny exited the canvas in 1998, though the actor and character have returned on several occasions in 2002, 2003 to 2004, 2008 and 2012.
 A rock star, the character is known for his relationships with Lauren Fenmore, Christine "Cricket" Blair, and Phyllis Summers.
ASC Jeanne d'Arc a Senegalese professional association football club, has gained entry to Confederation of African Football (CAF) competitions on several occasions.
 They have represented Senegal in the Champions League on nine occasions, the now-defunct Cup Winners' Cup on four separate occasions, and the now-defunct CAF Cup on two occasions.
 Their overall representation is second behind Diaraf but is the Senegalese club who had the highest achievement being a finalist which was the 1998 CAF Cup.
 Both Jeanne d'Arc and Diaraf are Semifinalists at the CAF Champions League.
ASC Diaraf (or Djaraf, partly known as Jaraaf, mostly used in the Gambia), a Senegalese professional association football club, has gained entry to Confederation of African Football (CAF) competitions on several occasions.
 They have represented Senegal in the Champions League on thirteen occasions, the Confederation Cup on Four separate occasions, the now-defunct Cup Winners' Cup three separate occasions, and the now-defunct CAF Cup one occasion.
"The Disappointment" is a poem written by Aphra Behn.
 It was first published in 1680 (see 1680 in poetry) in the Earl of Rochester's "Poems on Several Occasions" and originally was believed to be Rochester’s own work.
 However, four years later, the poem was re-published in Aphra Behn’s "Poems on Several Occasions" and she received proper credit.