Tengu "heavenly phoenix") are a class of supernatural creatures found in Japanese folklore, Half humanoide, half crow. Legends ascribed to them great knowledge in the art of skilled combat. As well as being the instructors of famous warriors in Japans History. Including the Ninja
This displays the seven main values possessed by warriors following the Bushido code. The Bushido code values integrity and encourages people to be selfish to some extent, but also requires people to be loyal to those around them. It also mentions compassion and honesty, which is surprising because these values are not seen in a favorable light in Mishima's novel.
Samurai "It is bad when one thing becomes two. One should not look for anything else in the Way of the Samurai. It is the same for anything that is called a Way. If one understands things in this manner, he should be able to hear about all ways and be more and more in accord with his own." ~ Hagakure