To write a 'critical care FMAB fanfic', begin by brainstorming unique scenarios. Maybe there's a new alchemical disease that requires critical care. Research medical procedures and adapt them to the FMAB universe. Develop your characters. For the medical staff, give them distinct personalities and skills. Show the emotional journey of the patients and those taking care of them. Use the existing lore of FMAB, like the Homunculus and their relation to life and death, to add depth to your story. Also, don't be afraid to create new locations or organizations related to critical care in the FMAB world.
First, study the world of Fullmetal Alchemist: Brotherhood thoroughly. Know the rules of alchemy, the different characters and their personalities. Then, think about how critical care would fit into this world. You could start with a character getting seriously injured. Next, create a plot around their recovery and the challenges they face. For example, they might need rare alchemical ingredients for treatment.
Writing a 'critical care FMAB fanfic' can be an exciting endeavor. Firstly, immerse yourself in the FMAB universe. Watch the anime, read the manga, and understand the themes and concepts. When it comes to critical care, consider the technological and magical aspects. In FMAB, alchemy can be both a tool and a hindrance in providing care. You can introduce new alchemical techniques specifically for critical care. For characters, think about who would be involved in critical care - perhaps some of the State Alchemists have a hidden talent for healing. Create a conflict, like a shortage of resources for critical care or a political interference in medical treatment. Build a story arc that shows the development of the critical care situation and its resolution, all while staying true to the spirit of FMAB.