【Which Ninja】How "Ninja" Is Sekiro Shadows Die Twice?

Ever since E3, we've been DYING to talk about Seiko, Shadows Die Twice. Everything from Sekiro's items, to his prosthetic tools, to even how he fights! But just how ninja IS the Lone Wolf? Do his items and gadgets reflect real life ninja? Or is the stab-happy Sekiro more samurai than shinobi?