Among the many abilities and fighting styles that don't come from a devil fruit (such as Rokushiki, Fishman Karate and Jujutsu, Merman Combat, Hasshoken, Okama/Newkama Kenpo, Diable Jambe, Ideo's boxing style, Electro, etc...) which one is your favorite ?
I must say that I really like Rokushi and Fishman Karate and that I have a special fondness for Fishman Jujutsu and Merman Combat that allows to manipulate water directly like a waterbender in Avatar and that I think these two martial arts are not used enough.
I must say that I really like Rokushi and Fishman Karate and that I have a special fondness for Fishman Jujutsu and Merman Combat that allows to manipulate water directly like a waterbender in Avatar and that I think these two martial arts are not used enough.