The broadest category of powers in the world of Naruto is ninjutsu. Ninjutsu isn't the most clearly defined technique - broadly speaking, it includes all abilities outside of genjutsu (illusionary techniques) and taijutsu (body and hand-to-hand techniques). It can include the ability to summon any animal from dogs to slugs, as well as conjure powerful defensive techniques like Sasuke's Susanoo, elemental attacks like Kakashi's Chidori, and existentially terrifying powers like Orochimaru's Living Corpse Reincarnation.
The best ninjutsu users in Naruto boast not only one formidable technique, but can often use five, nine, or even hundreds of different jutsu. You don't want to be on the wrong side of any of these powerful ninjas.
Be sure to check out the best Lady Tsunade quotes if you like the females that use ninjutsu.
It doesn't matter what kind of jutsu Madara Uchiha is using - he's one of the most talented ninjas in Naruto history, period. Though he can use every form of nature release, he specializes in fire-based attacks, including a giant fire blast shaped like a dragon.
He can also combine elements to create storms, grow plants, and more. He can levitate, detect another being's chakra from thousands of miles away, pass through solid matter, and create shadow clones that are so substantial and long-lasting that he can use them to fake his own death.
A master of most forms of jutsu, Itachi Uchiha is one ninja you don't want to face alone. He's skilled in multiple elemental techniques, including the Uchiha family's signature move Great Fireball Technique. He's also adept as using the powerful Water Dragon Bullet Technique, which he can use without access to water of any kind.
He can also summon swarms of crows and create exploding shadow clones.
Minato Namikaze wasn't the Hokage for nothing - he's a wildly talented ninjutsu user who can use a wide range of techniques. He invented the Rasengan, a giant ball of energy that can be hurled at enemies.
He also uses the Flying Thunder God Technique, which allows him to instantly teleport to any location he's previously left his seal on, including moving targets like an enemy ninja he might be tracking.
One of Konoha's founding members, Hashirama Senju, boasts formidable ninjutsu prowess. Though skilled in a variety of techniques, he's best known for his powerful chakra reserves and a unique ability, Wood Release, which allows him to manipulate the area around him, altering everything from vegetation to the ground itself. He could also create structures strong enough to capture and suppress tailed beasts.
This ability can be used for all sorts of incredible or devastating purposes, which is why Orochimaru went on to kill numerous children who were in pursuit of replicating it.