Budo Taijutsu consists of 9 warrior schools of training. Some schools, such as Togakure-ryu, are said to date back earlier than the 1500s.
The 9 warrior schools are Takagi Yoshin Ryu Jutaijutsu, Kukishinden Ryu Happo Hikenjutsu, Shinden Fudo Ryu Dakentaijutsu,
Gyokko Ryu Koshijutsu, Koto Ryu Koppojutsu, Gikan Ryu Koppojutsu, Togakure Ryu , Gyokushin Ryu and
Kumogakure Ryu (see list here).
Takagi Yoshin Ryu Jutaijutsu
Takagi Yoshin Ryu Jutaijutsu, translated to 'High Tree, Raised Heart School', is a system that 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 use ukemi to fall or roll safely. This ryu is known as the ;bodyguard school', and was founded by Takagi Oriuemon Shigenobu around 1650.
Kukishinden Ryu Happo Hikenjutsu
Kukishinden Ryu Happo Hikenjutsu, translated to 'Nine Spirits School' is a battlefield style whose specialty is the use of many
different weapons including spears, swords, hanbos, etc.
Many of the weapon techniques
(hanbo, bo, yari, naginata, etc.) in Bujinkan come from this school. Kukishinden Ryu was founded by
Izuma Kanja Yoshiteru in the mid 1100s.
Shinden Fudo Ryu Dakentaijutsu
Shinden Fudo Ryu Dakentaijutsu, translated to 'Immovable Heart School' is a system specializing in dakentaijutsu (striking techniques), and jutaijutsu (hard grappling techniques). This was the first ryu that Takamatsu learned form his grandfather. This ryu was also founded by Izuma Kanja Yoshiteru in the mid 1100 who also learned Chinese kenpo.
Gyokko Ryu Koshijutsu
Gyokko Ryu Koshijutsu, translated to 'Jeweled Tiger School', is 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. Gyokko Ryu was originally founded by Cho Gyokko who was said to have fled China during the Tang Dynasty around 900 AD. This ryu forms much of the basis for the Bujinkan system including the kihon happo.
Koto Ryu Koppojutsu
Koto Ryu Koppojutsu, translated to 'Tiger Knocking Down School' is a style specializing in koppojutsu or bone-breaking techniques and is very linear in motion. This style was originally organized into a ryu by Sakagami Kunishige in the mid 1500s. The name of the school means to knock the tiger down with the tips of the fingers and historically, training started with striking sand and gravel, then larger stones for conditioning.
Gikan Ryu Koppojutsu
Gikan Ryu Koppojutsu, translated to 'Truth Loyalty and Justice School', was originally founded by Uryu Hangan Gikanbo in the mid 1500s and specializes in koppojutsu or bone-breaking techniques. This style is known for its low stances, with much of the footwork within the Bujinkan system coming from this ryu.
Togakure Ryu , translated to 'Hidden Door School' is the second oldest of the nine traditions, this ryu forms much of the basis for the techniques taught in the Bujinkan. This system is famous for its use of such weapons as shuko and shuriken. It was founded by Daisuke Togakure in the late 1100s.
Gyokushin Ryu , translated to 'Jeweled Heart School' is the second ryu in the Bujinkan system was founded by Sasaki Goemon Teruyoshi in the mid 1500s. Not much is known of this ryu except that it is an Iga ninja school and concentrated more on the espionage side of , rather than the fighting side. It is also known for its use of sutemi (sacrifice) throws.
Kumogakure Ryu , 'Hiding in the Clouds School', is the third of the ninja ryus, it uses similar taijutsu as Togakure Ryu, and is also known for double blocks and strikes This ryu originated with Einaizaemon Ienaga Iga in the mid 1500s.