A, born with good qualifications, superior strength, good at advanced endurance, and at least one level of endurance, such as Hatake Kakashi. Kakashi entered the underground organization when he was very young, and showed amazing talent in the third grade. Kakashi had reached the state of forbearance when he graduated from forbearance school. In the dark, his strength was equivalent to the elite. Later, he became the sword of three generations of Huo Ying, and he was called Replica Ninja and sharingan. And the white robe that Payne came out to defend when he invaded Konoha. He is good at many advanced ninjas, such as the Four Purple Inflammation Array, and he has easily suppressed the three-headed dogs in hell.
Second, super pupil surgery. Such as Uchiha Itachi and Shuishui. Neiguang family is famous for sharingan, while Uchiha Itachi is a genius in Neiguang family, and Uchiha Shisui also has sharingan's strongest illusion-another god. After Tuanzang took Shuishui's eyes, Shuishui's suicide made thirteen-year-old Uchiha Itachi wake up Kaleidoscope Shalingen. Later, he accepted the order of Tuanzang and wiped out the Neichibo clan.
Third, he is good at rare mysteries or blood circles. For example, Captain Yamato (decorated with Tiancang) and Yamato are the test-tube babies left over from orochimaru's experiments on Konoha. Because Yamato is the only person who successfully transplanted the first generation of cells, Yamato can use the unique wooden shield of the first generation. In addition to Yamato, there are also many talented people in the dark, such as Aburame Torune, one of Tuanzang's subordinates. He was boarded by a nano-scale poisonous insect with great lethality, so he was isolated from the world since he was a child and never even went to a ninja school.