Eh I'd suggest OVA which is basically a spiritual successor to BESM. Does the same stuff but much faster and simpler. 

Of course if you want something complex I'd suggest Anima: Beyond Fantasy because it pretty supports doing all sorts of JRPG and anime concepts so long as you can build it, plus with the expansion book called called Dominus Exxet it gives access to expanded Ki techs which is a form of magic but for fighters and can be used for certain semblances. Also it grants access to a special weapon type which is literally the transforming weapons from the show.