Another popular character could be Roy Mustang. His ambition and his use of alchemy for his own goals, as well as his complex personality, draw readers' attention. He has a unique style of using alchemy which is quite fascinating.
Edward Elric is a very popular character. His determination and his journey in the world of alchemy, despite his physical losses, make him a memorable and beloved character.
There's also Winry Rockbell. She is not only an important support for Edward but also has her own skills in machinery which is related to the alchemical world in some ways. Her character adds a touch of normalcy and yet is integral to the story.
The main character is the one who gets reincarnated as an alchemist. His name might vary depending on the specific version, but he's the central figure. There are also often his mentors or teachers in the world of alchemy. They play important roles in guiding him on his journey to master alchemy. And then there are his friends or comrades he meets along the way, who join him in his adventures and challenges.
I don't know for sure since I haven't read the novel. But usually, there would be the chaos alchemist as the main character. There might also be a mentor figure who teaches the alchemist the ropes, or a sidekick who accompanies the alchemist on their adventures.
The main character is, of course, the peerless alchemist himself. His name might vary depending on the specific translation, but he is the central figure driving the story forward with his alchemical skills and adventures.
I'm not sure as I haven't read it, but it's likely that the first alchemist is a main character. There could also be a mentor figure who guides the alchemist in the early days of their journey, and perhaps an antagonist who tries to stop the alchemist from achieving their goals.
There may also be a rival alchemist who is popular in these fanfictions. This character challenges Sakura, either in terms of her skills or in her quest for alchemical knowledge. Their clashes and interactions can create exciting plot twists and development in the story.
In 'the alchemist god light novel', one of the most interesting characters is the girl with the special alchemical gift. She has an ability that no one else has, which makes her stand out. Her character is also complex, as she struggles with the power she holds. The old alchemist in the hidden tower is also very interesting. He has a wealth of knowledge but is also very secretive. His interactions with the younger characters add depth to the story. And then there is the street - smart character who uses his wits rather than pure alchemical power to get by. His character provides a different perspective in the world full of alchemists.
The main character is surely the last surviving alchemist. There may also be some side characters like his friends or foes. His friends could be those who support him in his journey, perhaps other scholars or people who believe in the power of alchemy. His foes might be those who want to use his knowledge for evil or those who oppose alchemy altogether.
Mustang's right - hand man, Riza Hawkeye, is quite interesting. Her loyalty to Mustang, her sharpshooting skills, and her own moral code make her a great character. Father, as the main antagonist, is a very interesting figure. His grand plan for the world, his manipulation of others, and his mysterious origin all contribute to his allure. And May Chang, with her small size but big heart, her unique alchemy, and her connection to the Xingese alchemic traditions, is also one of the more interesting characters in the 'Fullmetal Alchemist Light Novel'.
The titular last alchemist is likely to be one of the most interesting characters. Their unique skills and knowledge of alchemy set them apart. They probably have a complex personality shaped by their solitary pursuit of alchemy.
There might be some rivals or fellow novice alchemists. They could compete with the main novice alchemist, which adds some tension and drama to the story. Their different personalities and approaches to alchemy would make the interactions interesting.