Hey for his mutant power could be the ability to copy other people’s abilities and modify the abilities he gets including the ability to combine them but their is a downside so he is not to overpowered and that is they are weaker then those he copyed from and depending on either on how strong his body or mind or soul or all together he can have a certain number of abilites and if is at the limit he has to lose one of choice and he can replace it and good luck with novel it is great 👍 and their are my small ideas.
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LIKEIt depends on what you picked is it body or mind or soul or all three or combination of two. because the spider bite and oz serum strengthend his body and mind and the reincarnation strengthend his soul and mind.
The power to have all powers or copy powers or absorb powers is a very overused trope that is almost a cliche at this point. It usually kills novels because when your MC can do anything, then everything becomes boring and filled with plot holes and inconsistencies