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Material equivalent exange: the price of something is the exact raw materials needed to build it(if you want an iron statue that weights 5 pounds, you need to sacrifice 5 ponds of iron for it)
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Conceptual equivalent exange: the price of something is the conceptual value someone puts in it(if a loved one's arm is worth the entire body of 100 criminals in your eyes, then to get said arm you need to sacrifice the entire body of 100 criminals. If you consider something priceless, then nothing you sacrifice will ever be enought)
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Human transmutation: simply can NOT be done no matter what(maybe because it is a form of "conceptual equivalent exange" where you deem what you want as "priceless")
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I wanted to put edward elric somewhere, but when i was looking at fma alchemy i found some contradictions: edward wanted a way to resurrect his mom, he coulden't just get the raw materials(water, carbon, etc) and do it because it was "human transmutation" and such a thing is impossible to ever be done, he lost a leg in the atempt(and later an arm) and spent YEARS trying to find a way to grow them back, sure, regrowing limbs was not "human transmutation" and could be done, but such a thing fell under "conceptual equivalent exange" instead of "material equivalent exange", so edward coulden't just get raw materials for new limbs and instead needed something "conceptualy equivalent" to his limbs to sacrifice, but thing is... HUMAN CHIMERAS EXIST! The human chimeras don't go by the "conceptual equivalent exange"(the price of a life is a life), they instead go by the "material equivalent exange"(the price of a radio is the raw materials needed to build one(copper, iron, etc)) that all inanimate transmutations follow, SO WHY IS REGROWING A LIMB "CONCEPTUAL EQUIVALENT EXANGE" BUT MERGING SOMEONE WITH A SNAKE IS NOT?! An argument can be made that the one making the chimera does not see the life of their "ingredients" as having value, but then again, the greed homunculus made human chimeras! And for him every single thing he own is "priceless", including the guys he turned into chimeras(an argument can be made that it is the other way arround and everything greed does NOT own is priceless and what he does own can be discarded no problem, but then again, not an equivalent trade)
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Another point that contradicts the world's logic is that while "ressurrecting someone" is "human transmutation" and therefore impossible to ever be done, soul manipulation is NOT "human transmutation", as edward did get alphonse's soul into a suit of armor(and there was also that serial killer who also got turned into a living armor)! Sure, it did cost edward an arm, but suceeded! And "human transmutation" is something IMPOSSIBLE to be done! AND HOW THE F*CK DID THAT NOT COUNT AS "RESSURRECTING SOMEONE"?! ALPHONSE'S ENTIRE BODY WAS CONCEPTUALY SACRIFICED! YA CAN NOT TELL ME THE DUDE WAS STILL ALIVE BY THEN!!! AND EVEN IF HE WAS STILL ALIVE, ALPHONSE'S SURVIVAL WAS VERY MUCH ON "PRICELESS" CATEGORY THERE FOR EDWARD! AN ARM WOULD VERY MUCH HAVE NOT BEEN EQUIVALENT TO ALPHONSE'S SURVIVAL!!!
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This "conceptual equivalent exange" makes no sense in canon, you can't just use a stack of money to transmute groceries even if it IS equivalent on a conceptual level, money and groceries fall under the "material equivalent exange" and that will never change, transmuting an arm and a leg CAN change for some absurd reason(human chimeras falling under the "material equivalent exange" but nearly everything else faling under "conceptual equivalent exange")! In the end, i can not see myself beeing able to write a fic where mc has fma alchemy without overhauling the entire power system and removing "conceptual equivalent exange" entirely, then i decided to use the "overhaul" quirk from mha instead, but the overhaul quirk is a bit diferent then fma alchemy: while fma alchemy CAN completely deconstruct something before putting it back together, overhaul has no choice and will ALWAYS do that! Overhaul can not make something halfway, it is all or nothing and that bugs me for some reason, so in the end i decided i will be mixing the 2 powers instead of picking either one or the other
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Mc will be able to manipulate matter they touch(range is still a matter of debate), they will be able to move atoms and molecules but NOT separate molecules into atoms or unite atoms into molecules(so if mc is in the bottom of the sea and drowning, they can't simply separate the water's oxigen and hydrogen into breathable air for himself), mc will be able to transmute his own body(regrowing limbs and stuff) and the bodies of others but will NOT be able to ressurect someone(if the soul is already in the afterlife then mc simply can not reach it and therefore the revived body will just be a soulless comatose empty husk, if someone manage to have the soul of the revived on hand for some reason then it is doable but if the brain had to be made from scratch then the result would be a newborn baby in the body of the revived pearson(as mc have no way of knowing a pearson's memories or how those memories are wired into their individual brains(if mc has acess to some absurd magic scan ability, then in theory they can scan someone's brain and build a perfect replica, so if someone wants to migrate bodies for some absurd reason(mc can already alter bodies freely, why would someone need a new body made from scratch? -_-) then in this scenario, it is doable(mc will still need help migrating the soul(mc can't manipulate souls), but the new body will be perfect))))
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As for where i will place this mc? I still don't know. Sugestions anyone?