AegisGold The system works like this....
1: You unlock an ability... there is no rating in them as all are equal in potential, if you think yours is shit then it will always remain shit.
2: The esper mutation occurs due to a person blossoming the ability to communicate with dark matter(the real one, that is around us) at 10% you awaken your ability.. at 20% rank1 esper. 40% rank2 esper, 60% rank3 esper, 80% rank4 esper, 100% rank5 esper.
3: Passive abilities come with the awakening, like ability to use that said energy to strengthen the body and evolve it genetically, while also giving those lucky enhanced senses and reasoning ability(affect is cumulative with esper abilities)(also this may result in making a person not able to have children as your genetic code will become a lot different from normal humans and even espers as their evolution path is totally different)
SO magic in this system may not be able to blossom as you may imagine(don't think about Magus or warlocks or even Adepts.. their system is entirely different) P.S> we got technological advantage and there may be lots of batman(normal people with gadgets) kicking the assess of espers left and right.( if the espers only use their power and not their brain and external things like guns and stuff)