Yeah that kind of feel. I've played tristat BESM before a long time back. Might still have books for it. 3.5/pathfinder I'm very acquainted with but I feel like it gets too crunchy. If a blanket WOD might work too but then it's trying to fit in the magic/abilities. What I'm thinking of has a something that could be substituted for mana or stamina as well. To fuel non magic abilities.
Also thinking maybe Scion might expand on my WOD idea.