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.
The main character is surely the first alchemist. However, there could be a love interest for the alchemist, adding a romantic sub - plot to the story. There might also be a group of characters who form a sort of alchemical guild or organization, and within that, there could be leaders and followers, all with their own personalities and motives that interact with the first alchemist's 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.
The main characters in 'Fullmetal Alchemist First Story' are Edward and Alphonse Elric. Edward is a skilled alchemist who is driven by his desire to get his and his brother's bodies back to normal. He is highly intelligent but also impulsive at times. Alphonse, in his armored form, provides moral support to Edward. Additionally, characters like Winry Rockbell, who is Edward and Alphonse's childhood friend and a skilled mechanic, also play significant roles. There are also antagonists like the homunculi who constantly oppose the Elric brothers in their journey.
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.
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.
The alchemist himself is surely an important character. He is the one with the knowledge of alchemy and often guides the protagonist. Then there's the protagonist, who is on a journey of learning and discovery in the world of alchemy. There might also be a mentor figure, perhaps an old wise man who imparts some initial wisdom to the protagonist at the start of their journey.
The main characters are Edward and Alphonse Elric. Edward is the older brother, a talented alchemist who lost parts of his body in a failed attempt at human transmutation. Alphonse, the younger brother, has his soul trapped in a suit of armor.
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.
I'm not sure exactly who the main characters are without more information. But typically in an alchemist - themed visual novel, there could be an alchemist protagonist.