They are: four generations, Jiraiya, Naruto, Muye Wan and Kakashi.

Spiral pill is an S-class ninja developed by four generations, which is obvious to all. It is also difficult to learn this technology. If I remember correctly, the four generations developed this technique in about three years. Jiraiya learned it quickly and once showed it off like the four generations (theatrical version). Jiraiya gave it to Naruto and Naruto gave it to Muyemaru. At the same time, Kakashi also learned.

There are only four generations of spiral pills in the animation, Naruto and Mu Ye pills are often used, others have their own other endurance skills, and Mu Ye pills are rarely used. However, it was compared that Kakashi and Naruto used spiral pills respectively, and finally Kakashi failed.

I have been playing Naruto's mobile game recently, and found that Naruto, Four Generations, Muyemaru and Jiraiya's big moves are all Muyemaru, but some are improved and some are normal.

However, I don't think Spirulina Pills can be invincible all over the country. Although Naruto hit all the invincible hands in the world with spiral pills, there are too many fighting skills and strategies involved, as well as the aura of Naruto's mouth and pig's feet.

Also, which country is the subject talking about, the country of fire? In the country of fire, everyone recognizes spiral pills, but not because of Naruto, but because of four generations. In contrast, Spiral Pill as an S-class attack ninja can obviously be among the best (although many ninjas are S-class, but it is not an attack attribute), but if it is invincible, it will feel worse, but the improved version of Spiral Pill, such as Feng Dun, such as Tai Chi, is still quite powerful.