Makima in Fullmetal Alchemist Brotherhood Explained

If you've landed here wondering about Makima's role in Fullmetal Alchemist: Brotherhood, let's clear the air right away: Makima, the enigmatic and powerful Public Safety Devil Hunter, is a central character in Tatsuki Fujimoto's Chainsaw Man manga and anime, not Hiromu Arakawa's Fullmetal Alchemist: Brotherhood. There is no official crossover, and she does not appear in the world of alchemy, automail, and Homunculi. It's common for fans to imagine crossovers between beloved series, and given the popularity of both Chainsaw Man and Fullmetal Alchemist: Brotherhood, it's easy to see why such a question might arise....