The Extraordinaries (The Extraordinaries #1) by TJ Klune
Nick Bell? Not extraordinary. But being the most popular fanfiction writer in the Extraordinaries fandom is a superpower, right?
After a chance encounter with Shadow Star, Nova City’s mightiest hero (and Nick’s biggest crush), Nick sets out to make himself extraordinary. And he’ll do it with or without the reluctant help of Seth Gray, Nick’s best friend (and maybe the love of his life).