For the #3 spot I chose Chidori/Lightning Blade.
Chidori:
Description and Effect:
This jutsu channels a large amount of lightning-chakra to the user's hand. The high concentration of electricity produces a sound reminiscent of many birds chirping, hence the name. Once the technique is completed, the user charges forward and thrusts the Chidori into the target. This produces heavy amounts of damage that is usually fatal to humans. This technique iscla$$ified as an assassination technique because of the speed at which it is performed, despite the loud noise it produces.
Drawbacks:
This jutsu has a major drawback, however. The speed at which the attack must be done, combined with the fact that the user must run in a straight line, causes a tunnel vision-like effect for the user. This allows the enemy to easily counter the attack, making it a potentially lethal move for the user. Though this drawback would seem to make learning the technique fairly pointless, Sasuke and Kakashi are able to avoid the drawback because of their Sharingan eyes, which take in every detail regardless of how fast the user is moving. As an additional drawback, the large amount of chakra required limits its use to a few times a day. In Part I Sasuke can only use it twice a day (under his own power) and Kakashi can use it four times, though their limits have been shown to have increased to an unspecified level in Part II. Should the user attempt to go beyond their limit, all of their chakra will be drained and their very life force could go along with it, killing them.An additional problem, though not necessarily a debilitating one, is the fact that the large amount of chakra can also injure the user's hand if they put too much force into the attack. Sasuke does this while battling his brother, Itachi Uchiha, causing some of the skin to peel from his hand and leaving it slightly smoldering after the attack was finished.
Lightning Blade:
The Lightning Blade is an enhanced form of the Chidori with the same effects and drawbacks, but more concentrated. It is also said that Kakashi cut a lightning bolt in half with this technique. The first time he used it and the legend of him splitting said lightning bolt are speculated to be the origin of its name.
Because the Chidori is already powerful on its own, the Lightning Blade requires more chakra and better chakra control, which is exemplified in its appearance. The Chidori appears as simply a mass of white electrical chakra in the user's hand, the Lightning Blade is more focused and blue. Like the Chidori, Kakashi can use the technique four times a day, which is an incredible feat, considering the intensity and chakra requirements.He has increased his maximum amounts of uses in Part II as he uses the Lightning Blade six times and is still conscious. As seen when Orochimaru was talking to Kakashi after he used the Evil Sealing Method on Sasuke, he can apparently form the Lightning Blade at will without any hand seals. This was also seen after Naruto's first attempt to use the Rasenshuriken on Kakazu, Kakashi was able to form his Lightning Blade in a second with no hand seals.
Somewhere in the time-skip, Kakashi developed the ability to cast the technique on both of his hands, which has only been seen while fighting the Akatsuki member Kakuzu. In addition to learning different uses for Lighting Blade, Kakashi has been able to create a new jutsu. Although its name is still unknown, the technique can be fired from Kakashi's hand in a form of a dog, using Lightning Blade as a base. Even though Pain repelled the attack flawlessly, the technique was used in conjunction with long range and swiftness, making it a very seemingly powerful jutsu.
Kakashi can also use this jutsu as a strong defense, as used to repel the lightning jutsu launched by Kakuzu's Lion Mask directed to Shikamaru and Choji.
