Kakuzu has the Earth, Fire, Wind and Lightning hearts. The Earth one is his main (can't leave his body) and he starts with all of them within his body
On noticing Natsu, Kakuzu immediately performs the snake handseal to cause the ground around his opponent's position to rise up and curve around the opponent, effectively creating a cavern around him which possess a small opening at the top, but the size of it being just too small for the red-haired boy to squeeze through. Afterwards, Kakuzu causes a portal to open directly above the opening in the cavern causing a dense stream of mud to fall straight through the hole and envelop his opponent. The mud completely ensnares Natsu and fills the entire cavern to the brim, preventing any and all mobility as well as acting as a lid for the previously incomplete cavern.
Kakuzu:...
(Doton: Tsuchi Kairō) - Earth Release: Earth Corridor
Rank: B
Type: Supplementary
Range: Short/Mid
Chakra Cost: 20
Damage Points: N/A
Description: The user will first perform the snake hand seal and then cause the earth in the surrounding area to rise up and over a target and create a cavern, imprisoning the target. The user can leave an opening to allow attacks to go in to strike down the trapped adversaries, or close it up completely to prevent escape.
(Doton: Nentsuchi Otoshi) – Earth Release: Sticky Earth Drop
Rank: B
Type: Supplementary
Range: Short – Mid
Chakra cost: 20
Damage points: N/A
Description: The user creates an opening within the sky, which drips down onto the opponent a large amount of mud, covering them. It’s normally followed up by Lightning release: sixteen pillar bind to create a giant oven around the opponent and then using Fire release: Firing biscuit technique to ignite the oven, hardening the mud and immobilizing the enemy target.
Kakuzu: No, just testing the extent of your abilities
As soon as Natsu escapes the earth prison, Kakuzu changes his course of action to prevent his foe's next course of action. After performing the snake handseal, he fires a powerful spear of lightning towards his hands, placing his the end of his palms on top of eachother whilst doing so. The spears charge toward his opponent in an attempt to skewer through his body whilst electrocuting him completely, making the technique have a high level of killing potential.
On releasing the projectile of lightning, Kakuzu causes his fire and wind masks to emerge from his back, taking to the air above and behind his own position, each guarding each of his respective shoulders (Fire = Right, Wind = Left) much like guardian angels.
(Raiton: Gian) - Lightning Style: False Darkness
Rank: S
Type: Attack
Range: Short-Mid
Chakra cost: 40
Damage Points: 80
Descripton: The user after performing the hand seal snake emits lightning in the shape of a spear from their hands whilst kakuzu lightning mask emits it from its mouth, which then pierces the enemy. Its destructive power is great enough to even pierce through rock; meaning it has a high killing potential. The user can increase the number of spears to attack multiple enemies. This, coupled with the sheer speed of the lightning, makes it a difficult technique to evade. This strong attack can be defended against by an equally strong attack of the same element such as Raikiri.
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Natsu feels the wind pulling him back and releases more fire from his feet using his fire stream once more to push him forwards away from the wind and he continues with his brilliant flame, which collides with your fire blast cancelling each other out. As it does, Natsu lands on the ground releasing his seal through the smoke which you can't see, releasing a blast of natural energy all around him (being in short range from you now) blasting you flying back.As Kakuzu's mask watch their target dodge the powerful blast of lightning, they begin to act in response to protecting their original body.
The wind mask responds by releasing a powerful pressurized bullet of wind towards the centre of the battle field, directly behind Natsu's own position. On contact, the ball of wind begins swirling into a powerful whirlwind with an intense level of suction power, almost enough to suck in Kakuzu also.
At the same time, Kakuzu's fire mask releases an immense stream of flames from its mouth which rains down from the sky at such an angle Natsu's path to Kakuzu is blocked off and the stream of flames completely avoids their original body (Kakuzu). The stream of flames seeks to engulf the red-haired boy whilst he's thrown off balance by the suction of the whirlwind.
( Fūton: Kaiho Hakai ) - Wind Release: Open Destruction
Rank: B
Type: Supplementary
Range: Short - Long
Chakra cost: 20
Damage points: N/A
Description: Kakuzu, with his masks released from his body, releases a pressurised wind bullet towards the centre of the battlefield that creates a whirlwind which draws his opponent towards it.
Note: Can only be used by Kakuzu
(Katon: Gōka Messhitsu) - Fire Release: Great Fire Destruction
Rank: S
Type: Offensive
Range: Short - Long
Chakra cost: 40
Damage points: 80
Description: A technique where chakra kneaded inside the body is converted into fire, and then expelled from the mouth in a massive stream of intense flames.
Time to show you why i'm a little OP...As Kakuzu watches the stream of flames converge on Natsu he notices it relinquishing in size by the second, possibly by his opponent's own efforts, with the flames eventually becoming extinguished completely, leaving a dense smog in its place. Seeing this as the apt opportunity to spring a surprise attack on his opponent (due to the mutual loss of sight), Kakuzu quickly burrows underground and emerges fifteen meters behind his opponent's position (which he pinpoints due to sensing the pressure on the ground above).
As he does this, Kakuzu's wind and fire masks unleash another fury of attacks which rain down on Natsu's position, this time the nature of their attacks being indiscriminate since Kakuzu's original body won't be endangered as a result.
This time, Kakuzu's wind mask begins inhaling in such a way that Natsu is thrown off balance once again and begins hurtling towards the masks mid-air position. During this, Kakuzu's fire mask unleashes a fierce volley of spherical objects composed entirely of flames which possess explosive traits, which are exhibited once they come into contact with something. The suction of the wind mask forces Natsu to strike into the flame orbs, causing them to violently erupt on impact and cause him severe damage. Moments before the flame orbs make contact with Natsu, Kakuzu's wind mask completes its jutsu by expelling a powerful bullet of wind which tears through Natsu's body as the exploding shots surge out of control, devastating the opponent's body completely.
(Doton: Moguragakure no Jutsu) – Earth Release: Hiding like a mole technique
Rank: C
Type: Supplementary
Range: Long
Chakra cost: 15
Damage points: N/A
Description: The user changes earth into fine sand by channeling chakra into it, allowing the user to dig through it like a mole. While underground one can sense what is happening on the surface and use the information to launch a surprise attack on the enemy. Once can also hide deep in the ground, escaping to a depth where the enemy cant reach. It also appears that after digging, the ground can be returned to its original state, leaving no trace of where the user entered the earth.
( Futon: Shinkūdama ) - Wind Release: Vacuum Bullet
Rank: A
Type: Offensive
Range: Short - Mid
Chakra cost: 30
Damage points: The user will begin sucking in wind which results in drawing in opponents towards them and by kneading with their chakra in their mouth the user then releases the wind chakra in the form of a powerful bullet that blasts the opponent away.
( Bakuhatsu Enhogan ) – Exploding Flame Shots
Rank: B
Type: Attack
Range: Mid
Chakra Cost: 20
Damage points: 40
Description: The user shoots multiple fire shots from their hands that are able to cause fiery explosions on impact with any object. The shots can't set the opponent on fire, though they can cause damage by exploding on him.