In Project Tatterdemalion, a quirk of genetically engineered biology means that people with Psychic Powers- shinigami and Quincies- really do need caffeine as a basic nutrient, especially when they use their powers a lot. Shinigami in particular also like it because it makes their hearts beat faster- the process that makes them shinigami slows their heartbeats way down, and caffeine brings it back to normal.
In the cracky fanfic Reload, a "Groundhog Day" Loop type fic that long ago reached the lets-goof-off stage, we have Sasuke (who is currently female, long story) get up and reach for the nearest cup of coffee. Naruto comments that it was boiling moments ago.
In the Sword and Shield Verse, a crime-based Pokémon fanfic, we have BrendaJohnson, our main OC character who's partnered with Mewtwo aka VahanSmith. Just Brenda, who prefers her coffee "liquid, preferably alive". On the other hand, Mewtwo has stoutly refused to resort to coffee. Brenda considers that a sign of insanity.
Toy Hammer: Commissar Tomas Sturm takes a liking to Terran "recaff" (a.k.a. coffee).
Commissar Steve's entire motivation in A Day In The Life OFA Commissar is getting a cup of coffee. Justified, since his room-mate has night terrors and the beds are uncomfortable, so he barely gets any sleep. He goes completely berserk when he finds out Nathan Johnson, the Force Commander of the local chapter of the Blood Ravens, bought all the coffee on the planet. This escalates from teaming up with his Sitcom Arch-Nemesis, to challenging Johnson and his two friends ( The Librarian and Chaplain) to a cage match, to demanding the use of a Baneblade Super-Heavy Tank.