Not is Batman perhaps the ultimate unarmed combatant on the face of the planet due to the sheer amount of the different arts he masters but he is also a master shadow warrior, a ninja of true legend, a master rivaled by only a handful by men.
Under Kirigi, Tsunetomo and Chu Chin Li and then expanded by Cain Batman has learnt the art of the ninja but also the art of the Tao and the Chinese assassin, making him much, much more dangerous than a normal ninja. First of all he is one of the foremost combatants on Earth, with or without his weapons, but his further training has expanded his senses and skills to the level of rivaling metahumans.
Batman is a master of Haragei, a master who has expanded his physical senses over this plane of existence to another and thus becoming hyper aware of his surroundings without appearing to really being anything different from others. He is keenly aware of everything going on around him and also the microscopic and the astral world around himself. Furthermore he can feel that world around himself and thus being one of the most difficult targets for telepathy and also telepathic obfuscation. Along these lines the Bat has learnt and masters both the Sakki and Kiai. Kiai is the ability to feel the intent and thus be able to act accordingly. However Sakki is the force of the intention and with these three pillars the Bat can take the physical battle to another level, to the psychological, the mental plane. The Sakki and Kiai, completed with the mastery of Haragei can be used as physical weapons, a force of wills where every blow is even stronger than the physical ones. As a ninja and a master of haragei, Batman has learnt to cope without his sensory input, making him able to fight and function without any sort of handicap should he lose his sight or hearing, or other senses. The fact is that the Bat is far beyond the human senses and even though they are handy, they're not needed.
Chi is another facet and a tactic the Batman uses, much like Sakki, it can be projected through the combat. Batman has been shown, on numerous occasions, to be able to perform feats impossible to humans. He has been shown to kick down trees, punch through concrete and mortar walls. He can project his Chi out of his body and aid him physically, because of this it is no big feat for him to punch through living trees and walls. By focusing his Chi inside his body he can ignore the physical damage and pain he receives. Through his training, Batman has trained himself to ignore exhaustion, sleep deprivation, emotions and also pain and agony. To anyone looking at the Bat, there is nothing remotely human about him other than the chin. As a Bat, when under control, he feels no emotions, no fear, no love, he is completely indifferent to the world around himself and thus he is in tune with it as Tao teaches. He flows from one motion to another in the river of life, this granting him the sixth sense, intuism he always listens to, the thing that has saved his life on many occasions.
This form, this Tao was taught to him by Mistress Shao-La in the Himalayas. Bruce Wayne had heard about a master with great power residing in the mountains and the young boy wanted to learn more. He went to the master who'd teach him the Tao and also self-control. The light side of this force would give him the control over his emotions and the ability to be in tune with the world, but it wasn't enough for him. Bruce Wayne wanted power, true power and after Shao-La told him about Master H'Sien Tan he would venture out there and learn.
From H'Sien Tan Bruce Wayne learnt the path of personal power. He learnt from the man that he had two destinies and by choosing one of them he'd receive everything he had ever wanted and the second would make him nearly omnipotent. This path would be the path of personal power he sought to avenge and to protect. In time it would also consume him. This little story is part of the package H'Sien Tan taught Bruce. The acceptance. The acceptance of one's fate, one's death and one's power. It was also a craft he taught to Bruce, to know, to feel the world and the energies around himself, to harness those energies and glean answers from them. This form of spiritualism has served Bruce well, but also it has twisted him and he has found ways to distort it, making him appear the victim even if he has wanted it. From H'Sien Tan he also learnt a way to control himself, not just his emotions but his body. Bruce is capable of, instinctually, command his body to stop bleeding, force healing on himself and even more importantly, he is able to ignore the toll exhaustion and the lack of sleep inflicts on him. Also Tan taught him the way to slow down his heart, the flow of his blood, to the level of dying and yet remaining alive.
The dark forces of Tao, the greed, is a powerful mistress and because of this the person who wields these arts needs to be mentally strong to wrest the control lest it controls him in his path to power. This dark art comprises partly of alchemy and magic mixed in with the mental control and hypnotism and this is the most formidable teaching Tan had to give Bruce.
Batman is able to force his presence on others, much like the way the Wrath of God appears. He can grow in people's minds, project his terror on them and destroy their minds, but at the same time he can push his presence inwardly and just disappear from their mind's eye, right in front of them and none will know how nor why. Furthermore he has learnt the power of suggestion, the ability to appear as something else to anyone and this is the key behind his quick costume changes and his disappearances. To add to this, his skills in these arts have given him a willpower matched by nearly none as he can ignore anything and go through stone and rock. The last skill Tan gave to Bruce was the art of the Tiger Fist, a punch so powerful it can rend through mountains, a skill, an art known to only 5 people on Earth and only 2 of them survive 'til this day.
As a ninja, a shadow assassin, Batman has been taught to use his surroundings to his advantage and so he knows when there are people in the correct vantage points, he knows how to conceal himself so that he is virtually invisible and he knows the ways to use the surroundings offensively. This lesson is part of the reason why the Bat was created in this visage. Bruce knows the hearts of the men and he can defeat them before engaging them in combat. In ancient times in Japan, the warrior caste, the Samurai, used the Ninja because their honor couldn't handle the deceitful tactics. However, Batman has no qualms with this and actually he uses quite a lot of deception as he does his work. Chu Chin Li and later on David Cain taught him the assassination tactics and skills, so he is aware of how a possible assassin will work and will think, and he can prepare against these situations.
Japanese sword fighting or Kendo is part of the Bushido class and way of life and also practiced by Batman and Bruce Wayne. From Bushido and Taothe Batman has taken the meditation skills taught to him by Shao-La for clearing his mind and his conscience, even if Alfred tends to call it brooding. Many a time the Bat has solved a case while meditating or sleeping, which is quite the same thing for him as he utilizes the sleeping techniques Shao-La taught him.
The ways of the Shadow Warrior are quite many and there are different rumors and different legends about the ninjas, and when concerning the Bat most of them hold true. However the main thing about the ninja is that they're adaptable and Batman has taken this strategy in his heart and cherishes it. He adapts to any situation and if he isn't able to conquer, he will find another way to do it. May it be weapons, technology or knowledge, the Bat will always prevail....