Mabuni's Shitoryu can be said to be based on his five principles of blocking/self defense.
Rakka: Hard blocking. Striking an off-center or indirect attack with sudden maximum power.
Ryusui: Soft blocking. Redirecting a strong attack with a circular or deflecting parry.
Kushin: Springing. A reflexive, darting "out and in" or "up and down" kind of body shifting from any angle.
Teni: Changing positions. Taisabaki (footwork). Shifting or turning quickly out of the opponent's way.
Hangeki: Defense as attack. Brief but intelligent responses. Sen no Sen.
