I too do reckon that both arguments are true, that some powers produce inherently magical effects that can imitate the mundane, and some produce inherently mundane effects that can be augmented to supernatural heights via magic. The MC is a superhuman I definitely think falls into the latter category and could be used to prove that argument's validity. True, his body may be some sort of soup of organic and inorganic materials that explicitly relies on energy to stay in a specific shape, but I still think his body's materials are mundane despite that.
One piece of evidence he provides towards the latter argument is the fact that he can't just manifest magically tough materials. Instead of just say, making his bones as tough as diamond since it's supposedly magical bone, he goes through the trouble of actually turning his pre-existing bones to diamond. His bones aren't inherently magical and thus capable of just imitating the mundane properties of diamond, rather they need to be converted from one mundane substance to another using Monster Power/Energy as a medium to make that happen.
Another good example that argues in favour of the latter interpretation are the cases of Jordan and Nikki. They don't have Monster Power/Energy; even if they did it wouldn't work to maintain the MC's transformations, as the magical energy source needed to fuel a power is unique and incompatible with other powers. This implies the biomass the MC creates must be simply mundane biological material that just used a magical energy source to generate and shape it. It can't be just a magical construct imitating mundane flesh that vanishes if cut off from a supply of magic, because these two lack any magic to sustain its existence. Furthermore, it's also evident that superhuman cells are still subject to the cell death. If the MC's generated biomass was just a magical construct that evaporates due to bleeding magic, then Nikki and Jordan's parts would probably just evaporate over time since even Ella left dead material about. It'd be especially noticeable in Nikki, as having 300 million magically constructed cells of their heavily modified body evaporate every minute without a method to replace them would probably turn them into something Junji Ito would draw mid-conversation. Yet their parts actually do persist in the absence of magical Monster Power/Energy. Doll Ella's exposition further reinforces this idea. She says us that material made by them require constant energy to sustain themselves permanently, not that it needs to be mundane or magical. Thus implying that what's generated is just mundane biomass that can take mundane or magical energy.
TL;DR: I too think both arguments hold true depending on the superhuman, and that the MC's powers both fall into and can prove the validity of the argument that some superhuman powers have effects that are inherently mundane but can be augmented to supernatural heights via magic. My evidence for this proving the latter argument relies on him needing to replace mundane material with other mundane material rather than just alter their properties, and ordinary humans he's transformed not having altered or generated biomass evaporate despite not having any magical energy to fuel its existence, 300 million cells dying every minute and in-game evidence showing even biologically immortal superhumans such as Ella needing to replace their cells.
One piece of evidence he provides towards the latter argument is the fact that he can't just manifest magically tough materials. Instead of just say, making his bones as tough as diamond since it's supposedly magical bone, he goes through the trouble of actually turning his pre-existing bones to diamond. His bones aren't inherently magical and thus capable of just imitating the mundane properties of diamond, rather they need to be converted from one mundane substance to another using Monster Power/Energy as a medium to make that happen.
Another good example that argues in favour of the latter interpretation are the cases of Jordan and Nikki. They don't have Monster Power/Energy; even if they did it wouldn't work to maintain the MC's transformations, as the magical energy source needed to fuel a power is unique and incompatible with other powers. This implies the biomass the MC creates must be simply mundane biological material that just used a magical energy source to generate and shape it. It can't be just a magical construct imitating mundane flesh that vanishes if cut off from a supply of magic, because these two lack any magic to sustain its existence. Furthermore, it's also evident that superhuman cells are still subject to the cell death. If the MC's generated biomass was just a magical construct that evaporates due to bleeding magic, then Nikki and Jordan's parts would probably just evaporate over time since even Ella left dead material about. It'd be especially noticeable in Nikki, as having 300 million magically constructed cells of their heavily modified body evaporate every minute without a method to replace them would probably turn them into something Junji Ito would draw mid-conversation. Yet their parts actually do persist in the absence of magical Monster Power/Energy. Doll Ella's exposition further reinforces this idea. She says us that material made by them require constant energy to sustain themselves permanently, not that it needs to be mundane or magical. Thus implying that what's generated is just mundane biomass that can take mundane or magical energy.
TL;DR: I too think both arguments hold true depending on the superhuman, and that the MC's powers both fall into and can prove the validity of the argument that some superhuman powers have effects that are inherently mundane but can be augmented to supernatural heights via magic. My evidence for this proving the latter argument relies on him needing to replace mundane material with other mundane material rather than just alter their properties, and ordinary humans he's transformed not having altered or generated biomass evaporate despite not having any magical energy to fuel its existence, 300 million cells dying every minute and in-game evidence showing even biologically immortal superhumans such as Ella needing to replace their cells.
