Coryn told me this about : Well, I do believe a lot of the ideas behind Yu Yu Hakusho and a lot of other metaphysical/magical powers in anime come from onmyodo, which was the ancient/medieval Japan's rough equivalent to a western wizard/alchemist type character.
Manga and such tend to draw more heavily on the supposed magic they could do, and less on the philosophy and rudimentary science, but still that's probably where I'd start my research.
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But what about this

https://www.youtube.com/watch?v=EoLVRJdboLgwhat is this alchemy can we have a discussion
https://toarumajutsunoindex.fandom.com/wiki/Aureolus_Izzardwhat should I study and research
https://www.youtube.com/watch?v=VGHQka9x3lkI want my own version of studies from this
https://toarumajutsunoindex.fandom.com/wiki/Imagine_Breakerimagine breaker has connection with dragons what am I missing out