From what I can tell, his fighting style is mixed like Jeet Kune Do, whatever move is the most direct for the immediate circumstance making the swiftest and shortest line between two points. There is European Boxing, Muy Thai Kickboxing, Ishin Ryu Karate, various forms of Kung Fu, and a few others mentioned for his punching. I suspect there is some Krav Maga, Russian Systema, as well as some of the "lost" arts that comprised the CQB aspects of Ninjutsu because it really seems to be battlefield MMA meant to deal with life or death situations. There is some European Wrestling, Judo, Aikido, and grapples from previously mentioned techniques. Kicking is of course used in all of these arts, but Hapkido certainly seems to be present as well as some beautiful use of Capoeira. Parkour is at play for mobility, but free-running was a necessity in Ninjutsu as well. Ninjutsu was actually the art of camoflauge, stealth, espionage, and extreme mobility, not a fighting style. In the Netflix series, Daredevil has been trained by Stick, who has picked up techniques from all across the globe, but with a heavy emphasis on Eastern martial arts. Daredevil has complimented this with his own training borrowing from his father's brawling style of boxing and whatever comes naturally. The show has really done a spectacular job of creating a truly unique fighting style that is both technically rich and absolutely brutal. It's not like Batman or anyone else...it's Daredevil.