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Hero High is the third installment made by Mattel after Monster High and Ever After High. The subject here is that the characters are kids of superheroes or supervillains from Marvel and DC Comics books.
Like in Ever After High, pupils are divided among Justice (good guys), Doom (bad) and Sidekicks. (instead of Royals and Rebels). And, like in Monster High, characters mostly had daughters, feminizing the cast. Notable students:
-Laura "Lara-El" Kent: Daughter of Superman and Lois Lane. She lacks the power of flying and keep it a secret
-Brad Wayne-Prince: Son of Batman and Wonder Woman. He do not have the same powers than his mother.
-Luna Wayne-Prince, his sister. She inherited the amazons powers.
-May Parker, Jr: Daughter of Spider-Man and Mary-Jane Watson. She denies her feeling for one of the Doom.
-Emerald Jordan: Daughter of Green Lantern and Star Sapphire. She does not dare reveal the identity of her mother who is considered as a supervillain.
-Morticia Wilson: Daughter of Deadpool. Inherited his madness, regeneration and skills with knives.
-Lena Luthor: Daughter of Lex. Not only she does not resembles him, but she's secretly Laura's friend.
-Joanna "Jo" Quinzel: Daughter of The Joker and Harley Quinn. Despite her black sense of humor, she didn't inherited their insanity.
- Olivia Osborn: Daughter of Green Goblin II and Liz Allen. She deeply resent May.
.- Nemo Octavius: Son of Doctor Octopus. The other half of the illicit couple with May.
-Nightingale Grayson: Daughter of Robin I/Nightwing and Starfire. She's hiding her powers (same as mother) in order to be a by the book sidekick, who are usually powerless.
-Sparrow Drake: Daughter of Robin III/Red Robin and Batgirl III. She is quite violent despite being only 7, because she refuse to become a traditional hostage.
-Francine Xavier: Daughter of Charles Xavier and telepathic. She had the idea to extend her school to non mutants pupils, as long as they're related to superheroes or supervillains.
-The couples of parents are usually the traditional couples, and do not mind last changes or additions in comics continuity.
-Combining Marvel and DC, it could be a tricky cross-over to stage on. However, a few stories involving both already happened. 
-Some students are, or resemble, (May, Lena...) already existing characters in the main continuity, but most are originals.
-Their story can be read in comic book version here: 
-Customized dolls here: