Question: Cartoon Action Hour is a role-playing game (RPG) designed to emulate classic action-adventure cartoons, such as He-Man, a character of a series of comic books and several animated television series, and in most variations, he is the alter ego of who?

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Supersnipe: Supersnipe is a fictional character who appeared in a series of comic books published by Street & Smith from 1942 to 1949.  Supersnipe was the imagined alter ego of Koppy McFad, "the boy with the most comic books in the world."  He was created by writer-artist George Marcoux, who had previously assisted Percy Crosby on the comic strip Skippy.

Masters of the Universe: Masters of the Universe (commonly abbreviated MOTU and sometimes referred to as "He-Man", after the lead hero) is a media franchise created by Mattel.  The main premise revolves around the conflict between the heroic He-Man, real name Prince Adam, and the evil Skeletor on the planet Eternia, with a vast line-up of supporting characters in a hybrid setting of medieval sword and sorcery and sci-fi technology.  Later spin-offs, especially "," also featured He-Man's sister She-Ra and her struggle against the Evil Horde, along with other planets/settings; however the main premise usually remained the same.  Since its initial launch, the franchise has spawned a variety of products, including six lines of action figures, four animated television series, several comic series, a daily newspaper comic strip, and a feature film.

She-Ra: She-Ra is a fictional character and protagonist of the Filmation cartoon "", debuting in 1985.  Also, a series of toys under her name were produced by Mattel.  She is the alter ego of Princess Adora and the twin sister of Prince Adam/He-Man.  She-Ra was intended to appeal to young girls in the same way that "He-Man" appealed to young boys.  Filmation writer Larry DiTillio created the backstory for the property.

He-Man: He-Man is the principal character of a series of comic books and several animated television series, characterized by his superhuman strength.  In most variations, he is the alter ego of Prince Adam.  He-Man and his friends attempt to defend the realm of Eternia and the secrets of Castle Grayskull from the evil forces of Skeletor.

Capes, Cowls &amp; Villains Foul: Capes, Cowls and Villains Foul is a pen & paper roleplaying game about comic book style superheroes and their adventures, developed and published by Parsons, Kansas-based Spectrum Games.  It officially debuted in the form of an illustrated 13-page PDF document released for free, called the "Quickstart Preview" in 2010.  A full rulebook was released in 2012.  It was written by Barak Blackburn, and uses a significantly modified version of a rules system that was first introduced in Cartoon Action Hour: Season 2 in late 2008.

The Marvel Action Hour: The Marvel Action Hour, later Marvel Action Universe, was a syndicated television block from Genesis Entertainment featuring animated adaptions of Marvel comic book heroes the Fantastic Four, Iron Man and "Biker Mice from Mars".  "The Marvel Action Hour" debuted in 1994.  "The Marvel Action Hour" lasted two seasons before being cancelled.

Spider-Woman: Spider-Woman is the code name of several fictional characters in comic books published by Marvel Comics.  The first and original Spider-Woman, Jessica Drew, had her own animated television series, and the second Spider-Woman, Julia Carpenter, was a regular in the 1990s TV series "Iron Man", part of "The Marvel Action Hour".

Robin (Earth-Two): Robin of Earth-Two is an alternate version of the fictional superhero Robin, who appears in American comic books published by DC Comics.  The character was introduced after DC Comics created Earth-Two, a parallel world that was retroactively established as the home of characters which had been published in the Golden Age of comic books.  This allowed creators to publish comic books taking place in current continuity while being able to disregard Golden Age stories featuring Robin, solving an incongruity, as Robin had been published as a single ongoing incarnation since inception.  Unlike his main counterpart, Robin is only the alter ego of Dick Grayson, who uses the title into adulthood, rather than taking on later codenames such as Nightwing or Batman.  In addition, the name "Robin" is not taken on by later characters.

Alter Ego (1986 video game): Alter Ego is a role-playing video game released by Activision in 1986.  It was created by Peter J. Favaro for the Commodore 64, MS-DOS, Apple II, and the Apple Macintosh.  The game allows the user to make decisions for an imaginary person (being therefore the player's alter ego) and shows what possible consequences these decisions could have on that person.  "Alter Ego" was available in both male and female versions, each using a different set of experiences.

Cartoon Action Hour: Cartoon Action Hour is a role-playing game (RPG) designed to emulate classic action-adventure cartoons, such as "ThunderCats", "He-Man", "", "G.I. Joe", "", "Inhumanoids", "Centurions", "Thundarr the Barbarian", "M.A.S.K.", and "Bravestarr".

Supporting paragraphs: Cartoon Action Hour He-Man
Answer: Prince Adam