Doctor Ninjutsu? I am proficient in more than 10,000 ninjutsu

Chu Xian traveled to the world of Naruto and awakened the evil ninjutsu talent.
You can learn any ninjutsu just by looking at it.
It is possible to deduce ordinary ninjutsu to S level.
False Ninjutsu Doctor: Spray a few small fireballs, then Necromancer, turn into a golden cudgel for melee.
A real doctor of ninjutsu: Master Yin-Yang Dunjutsu and Five Elements Ninjutsu, and integrate them into Magnetic Dungeon, Lantun Dungeon, Melting Dunjutsu, Dust Dunjutsu and other blood-successful boundar...