Question: Richard Fisk is the son of what fictional supervillain that was created by Stan Lee and John Romita Sr.?

Context paragraphs:
List of Marvel Comics characters: W: The Walking Stiletto is a robot supervillain created by Stan Lee, John Romita, Sr., and Sal Buscema, first appeared in "Captain America" #114 (June 1969).  Within the context of the stories, the Walking Stiletto is a creation and agent of AIM.  When Sharon Carter attacks a group of AIM leaders, they let loose the Stiletto to attack her, but she is saved by Captain America and Rick Jones, who destroy the robot.  Many years later, the Walking Stiletto is among the robotic collection of the Reanimator, who unleashes it on Wolverine and Nova.  Wolverine eviscerates the Walking Stiletto, rendering it inoperative.

The Comic Book Greats: The Comic Book Greats was a 1991 documentary series produced by Stabur Home Video.  The series was hosted by Stan Lee.  Stan interviewed a different comic book artist for each episode.  The artists interviewed include Todd McFarlane, Rob Liefeld, Jim Lee, Whilce Portacio, Sergio Aragones, Chris Claremont, Bob Kane, John Romita, Sr., John Romita, Jr. and Will Eisner.

Rhino (comics): The Rhino is a fictional supervillain appearing in American comic books published by Marvel Comics.  Although more than one character has assumed the identity of the Rhino, the first of these, and the one primarily associated with that identity, is Aleksei Sytsevich, who was created by writer Stan Lee and artist John Romita, Sr., and first appeared in "The Amazing Spider-Man" #41 (Oct. 1966).

The Wedding! (comics): "The Wedding!"  is a story from "The Amazing Spider-Man Annual" #21 in which Mary Jane Watson and Peter Parker (a.k.a. Spider-Man) get married.  It was published in 1987 and written by David Michelinie, featuring cover art by John Romita Sr.

Kingpin (character): The Kingpin (Wilson Fisk) is a fictional supervillain appearing in American comic books published by Marvel Comics.  The character was created by Stan Lee and John Romita Sr., and first appeared in "The Amazing Spider-Man" #50 (cover dated July 1967).

Richard Fisk: Richard Fisk is a fictional character, a criminal appearing in American comic books published by Marvel Comics.  He is the son of the Kingpin and his wife Vanessa Fisk.  Although he was originally a villain, he became an antihero.

Robbie Robertson (comics): Joseph "Robbie" Robertson is a supporting character in Marvel Comics's Spider-Man series.  Created by Stan Lee and John Romita Sr., he first appeared in "The Amazing Spider-Man" #51 (August 1967).

Dan Green (artist): Dan Green (born November 26) is an American comic book illustrator, working as an inker primarily from the early 1970s to the present.  He has often provided the finished art after receiving breakdowns by artists such as John Romita, Sr., John Romita, Jr., John Byrne, John Buscema, Sal Buscema, Marc Silvestri, George Pérez, Keith Giffen, Gene Colan, Jack Kirby, Steve Ditko, Carmine Infantino, Al Williamson, Bernie Wrightson and Keith Pollard.

John Romita Sr.: John V. Romita Sr., often credited as simply John Romita ( ; born January 24, 1930), is an American comic-book artist best known for his work on Marvel Comics' "The Amazing Spider-Man" and for co-creating the character The Punisher.  He was inducted into the Will Eisner Comic Book Hall of Fame in 2002.

Mary Jane Watson: Mary Jane "M.J." Watson is a fictional character appearing in American comic books published by Marvel Comics.  Created by Stan Lee and John Romita, Sr., the character made her first appearance in "The Amazing Spider-Man" #25 (June 1965).  She has been the best friend, main love interest and wife of Peter Parker, the alter ego of Spider-Man.

Supporting paragraphs: Richard Fisk Kingpin (character)
Answer: Kingpin