[1][5] Creating Dr. McNinja was Chris' full-time job; while the comic is free online, Hastings made money by selling books and T-shirts.
[9] A Kickstarter campaign was launched in 2012 for a spinoff video game to be called Dr. McNinja’s Radical Adventures.
From 2015 to 2018, after co-creating the character of Gwen Poole with Heather Antos and Jordan D. White for Howard the Duck, Hastings wrote the existentialist isekai solo series The Unbelievable GwenPool about her, across the storylines Believe It, Head of M.O.D.O.K., Totally In Continuity, Beyond the Fourth Wall, and Lost in the Plot.
[17] Beginning on January 28, 2015, Hastings replaced Ryan North as writer for the Adventure Time comic book series at Boom!
[26] Hastings also wrote the Wet Hot American Summer graphic novel, a prequel of the movie of the same name,[27] and the comic series Regular Show: 25 Years Later.
[28] Hastings has served as writer for several comic book miniseries for Dynamite: "The Six Million Dollar Man" based on the TV series[29] and "Sonjaversal"[30] which was expanded from its originally planned five issues[31] with a sequel, "Hell Sonja".
[32] Hastings co-created webcomics for the company ShiftyLook, adapting the video games Galaga and Dig Dug into comics.
[35] Since 2021, Hastings collaborated with Scott Cawthon on making graphic novel adaptations based on Five Nights at Freddy's books.