Shazam

Billy Batson is a pure-at-heart teenager who was chosen by the wizard Shazam to be imbued with the powers of six deities: the wisdom of Solomon, the strength of Hercules, the stamina of Atlas, the lightning of Zeus, the courage of Achilles, and the speed of Mercury. By saying, "SHAZAM!", an acronym of the six deities' names, Billy has the ability to transform into an adult superhero named Shazam.

Super Café: Teens and Titans
Batman briefly mentions Shazam when criticizing the inconsistent characterizations of DC media, with Shazam himself seen flossing.

How Captain Marvel Should Have Ended
In the end credits, Monica Rambeau is messing with Carol's suit when she accidentally turns it into Shazam's, referencing how Shazam was originally called Captain Marvel before copyright with Marvel Comics forced DC to rename him Shazam. Carol is horrified.

How Shazam! Should Have Ended
Shazam arrives at school to have lunch with his friend Freddy Freeman, bringing Superman along with him. Batman follows suit, and soon the cafeteria is filled with various DC superheroes.

Trivia

 * Shazam is the third character played by Zachary Levi that appears in HISHE, after Flynn Rider in Tangled and Fandral in the Marvel Cinematic Universe.
 * However, he is the first to have a different face than the others, not counting the Josh Dallas version of Fandral in How Thor Should Have Ended (in the Thor: Ragnarok HISHE, he has Flynn Rider's face to reference being played by Levi).