Some information about Bujinkan:

Soke Masaaki Hatsumi is the founder of the Bujinkan or "Divine Warrior House" and is the Soke (grandmaster) of the following ko-ryu or feudal-era traditions passed to him by his teacher, Toshitsugu Takamatsu:

Togakure Ryu Ninpo - 34th Soke
Translation: "hidden door" ninjutsu "concealing arts", "stealth arts" or "patient arts"
Summary: The second oldest of the nine traditions, this ryu forms much of the basis for the Ninjutsu techniques taught in the Bujinkan. Togakure Ryu Ninpo includes various punching, throwing and levering techniques. It is known by low and wide stances and also by very strong punches, which are mostly directed towards opponent's eyes, ears and diaphragm. This system is famous for its use of such weapons as shuko and shuriken. Daisuke Togakure reportedly founded it in the late 1100's. The emphasis is on escape and spying. Ninjutsu involves the use of little gadgets, espionage, concealment, sabotage, breaking in and escaping, etc. Togakure ryu uses a lot of techniques that incapacitate, often brutally, and is very deceptive. Along with Taijutsu, this school includes the arts of Ken jutsu (sword), So jutsu (spear), Naginata jutsu (halberd), Bo jutsu (sticks), Jutte jutsu (multiple bladed dagger), Tessen jutsu (fan), Ka jutsu (fire), Sui jutsu (water), Onshin jutsu (invisibility) and three school secrets, named Sanpo Hiden, which are Shuko (hand claws), Senban Shuriken (throwing daggers), and Shinodake (bamboo tube for breathing under water).

Gyokko Ryu Koshijutsu - 28th Soke
Translation: "jeweled (or pearl) tiger" koshijutsu "bone finger art"
Summary: Emphasis on striking weak or soft and vital areas of the body with the fingers and toes. As in Koto ryu, the system consists mainly of strikes and joint locks, but lacks any real throws. Most of the techniques comprising the "kihon happo" are found in this system. Its movement tends to be circular and small, and techniques often flank the opponent. The oldest of the nine traditions, this style is heavily influenced by Chinese kenpo and is known for its koshijutsu attacks to muscles and soft organs, also using fingers and thumbs for ripping and tearing. Cho Gyokko who was said to have fled China during the Tang Dynasty around 900 AD originally founded Gyokko Ryu. This ryu forms much of the basis for the Bujinkan system including the kihon happo.

Koto Ryu Koppojutsu - 18th Soke
Translation: "tiger knockdown" koppojutsu "bone structure art"
Summary: Emphasis on using the opponent's bone structure and skeleton to defeat him. Strikes are generally targeted to areas that disrupt spinal alignment and locks are applied in the same fashion. This system consists of mostly striking and some joint locking, but has no full body throws. Movement tends to be linear, and 45- degree angles are a trademark of this system. It is thought that the Koto Ryu came from China via Korea, by Chan Busho, a Chinese warrior. The school was eventually passed on to Sogyokkan Ritsushi who was also Soke of Gyokko Ryu and with him the two schools were brought completely together. Regardless of this they were taught and passed on to the next generation as separate schools within the same lineage. These two schools complement each other. Koto Ryu uses short distances between opponents - Gyokko Ryu uses long distances. Koto Ryu techniques are quick and straight to the point - Gyokko Ryu techniques are more complex. Koto Ryu concentrates on striking - Gyokko Ryu on locks and throws.

Takagi Yoshin Ryu Jutaijutsu - 17th Soke
Translation: "high tree raised spirit" jutaijutsu "soft art"
Summary: This system specializes in grappling and throwing techniques similar to aikido and judo. However, unlike judo and aikido, this style makes it difficult for the opponent to make ukemi (to fall or roll safely). This ryu is known as the "bodyguard school". Jutaijutsu uses an opponent's force against him. No resistance is offered, but rather the opponent's direction of movement is enhanced and used to defeat him. Jutaijutsu was frequently used by police and in more civil settings than other, more battlefield oriented arts.

Kukishinden Ryu Happo Hikenjutsu - 28th Soke
Translation: "nine demons' divine transmission" happo hikenjutsu "eight secret weapons arts"
Summary: This is a battlefield art. The weapons can be quite large, including spear and halberd. Techniques are done assuming the combatants are wearing armor, and the movements reflect this The techniques in Kukishinden ryu are said to have come from China and the land beyond China and is also said to be founded in the 12th century. This system was used as a naval art, and consequently the movements are designed for use on a ship that is slippery and rocking. Sensei Ueshiba the founder of modern Aikido, in his youth studied the art of Kukishinden ryu Happo Hiken jutsu from the Kuki family.

Shinden Fudo Ryu Dakentaijutsu - 26th Soke
Translation: "Immovable Heart School " dakentaijutsu "hard weapon body art"
Summary: Dakentaijutsu has throws, strikes, locks, and kicks done in a fairly straightforward manner. It uses the body as a striking weapon and often seems "hard" in application. The shinden fudo ryu was known for its use of nature as an ally, and techniques are often very casual looking. The founder of this school, "Izumo", learnt Chinese Kempo boxing. Today some of this is still noticeable within the techniques.

Gikan Ryu Koppojutsu - 15th Soke
Translation: "Truth Loyalty and Justice School " koppojutsu
Summary: This ryu is scarcely seen by members of the Bujinkan, but its techniques tend to be very direct and hard. This style is known for its low stances, with much of the footwork within the Bujinkan system coming from this ryu. This ryu was originally founded by Uryu Hangan Gikanbo in the mid 1500 and specializes in koppojutsu or bone-breaking techniques. This Ryu contains many special kicks, punches and throws.

Kumogakure Ryu Ninpo - 15th Soke
Translation: "hidden cloud" ninjutsu
Summary: The third of the ninja ryus, it uses similar taijutsu as Togakure Ryu, and is also known for double blocks and strikes. The taijutsu of this school is very similar to the taijutsu of Togakure ryu. The main differences are, that in Kumogakure ryu jumps as well as multiple blockings are used. The specialty of this school was Kamayari (sickled spear), which was also used for climbing on the ships. Another special weapon, used by warriors of this school was also Ippon Sugi Noburi, which was made of a 25cm long metal tube with three spikes, and through which a long chain with hooks at its ends was laid. This weapon was used for combat as well as for climbing. Also used was the Demon Mask, sometimes worn by the members of the Ryu, for masking their faces and for shocking the enemy. It may from here that the Kikaku Ken strike ("Demon Horn strike") has originated.

Gyokushin Ryu Ninpo - 21st Soke
Translation: "pearl heart" ninjutsu
Summary: The second ninjutsu ryu in the Bujinkan system. Not much is known of this ryu except that it is an Iga ninja school and concentrated more on the espionage side of ninjutsu, rather than the fighting side. It is also known for its use of sutemi (sacrifice) throws. It is believed that, the founder, Sasaki Goemon, was originally from the Gyokko Ryu or that the techniques of Gyokushin Ryu are based on the Gyokko Ryu. Gyokushin Ryu Ninpo was founded in the mid 1500's. This school is partially directed towards Cho Ho (spying). The main characteristics of this school are said to be Sutemi Nage (sacrificing throwing). This school preferred spying rather then combat, but it is known that many forms of Nage Waza (throws) were used.

Most of this information is from "An Introductory History to the Schools of the Bujinkan" by Paul Richardson. You can buy his book at:   http://www.hanako.co.uk/Shop/History-book.htm

Please visit the honbu at www.Bujinkan.com for more information.