Ninjutsu mysticism (kuji-kiri and such) comes from a Buddhist / Taoist off-shoot.
I think Buddhism or Wu-xing would be close to what you are looking for.
Buddhism is intuition and has some overlap with your concept above.
As ninja, both realistic and fantastic, were not always the flip out and kill someone martial badasses.
Stories and facts portray "ninja" that were not adepts or even mystic adepts, but rather straight up magicians/herbalists
The mysticism is tied to the idea of elements: Fire (火) Earth (土) Metal (金) Water (水) Wood (木)
The manuals of ninjutsu techniques utilized these
classical Chinese elements.I think Plant = Health is a solid choice for the historical ninja.
All elements yielded illusion and evasion but Fire was the most prominent with smoke bombs to trail clearing to distractions.
Earth was often an element for manipulating things, earthenware to "walk on water", tunneling, "changing shape" into rocks or beasts, etc.
Detection was not linked specifically to an element. Esoteric divination was sometimes used. Tea leaves, aura reading, elemental calculations, fortune sticks, are some examples.
Combat (which was not the primary realm of ninja, they had samurai for that) is another one that doesn't sink to a particular element well. Metal weapons were used though...
On a more fantastic level, there have been so many different interpretations that the sky is the limit.