While many stories and legends surround ninja in Japanese folklore, it’s important to note that the line between historical fact and myth is often blurred. Nevertheless, here are a few famous Japanese legends and stories associated with ninja:

1. Jiraiya Goketsu Monogatari (児雷也豪傑物語 – The Tale of the Gallant Jiraiya):
   • This is a classic Japanese tale featuring Jiraiya, a ninja with toad-related powers. The story revolves around Jiraiya’s quest to defeat the evil serpent wizard Orochimaru. Elements from this legend have inspired various modern works, including manga and anime.
2. Kamaitachi (鎌鼬):
   • Kamaitachi, often translated as “Sickle Weasel,” is a mythical creature associated with ninja in Japanese folklore. It is said to move at incredible speed, leaving behind a trail of wind, and cut its victims with sharp sickle-like claws.
3. Kasumi Gumo (霞雲 – Misty Cloud):
   • This legend tells of a ninja named Kasumi Gumo who possessed the ability to control mist. The story often involves stealthy maneuvers and the use of the environment to outwit enemies.
4. Sarutobi Sasuke (猿飛佐助):
   • Sarutobi Sasuke is a legendary ninja often depicted with incredible agility and the ability to communicate with animals. While there are historical figures named Sarutobi Sasuke, the legendary version is more akin to a superhero with ninja skills.
5. The 48 Ninja Rules (忍者四十八手):
   • This collection of ninja tactics and rules is sometimes considered legendary. It includes various stealth techniques, methods of concealment, and tactics used by ninja in different situations.

These legends contribute to the mystique and romanticized image of ninja in Japanese culture. They have inspired countless works of literature, theater, and modern popular media, shaping the perception of ninja as highly skilled and mysterious warriors.