In May 2007, Ewing created the comedy blog "The Diary of Ralph Dibney", writing as the titular DC Comics superhero (also known as Elongated Man), Dibney's therapist, or as the even more obscure DC Hero Richard Dragon, as they react to the events of each week's issue of the comic book 52.

[4] Breaking into American comic books, Ewing was also picked by Garth Ennis to provide a six-issue arc on Jennifer Blood, published by Dynamite Entertainment,[5][6] and a spin-off series The Ninjettes.

[7] His debut prose novel Pax Britannia: El Sombra, published by Abaddon Books in 2007, features a mysterious Mexican hero fighting back against the menace of steam-powered Nazis.

[15][16][17][18] In May 2023, it was announced that Ewing would write The Immortal Thor, with Martín Cóccolo serving as artist and debuting in August that same year.

[21] In September 2024, it was announced that Ewing would pen the ongoing series Metamorpho: The Element Man with Steve Lieber illustrating and set to debut in December that same year.