Overhaul (Quirk)

Overhaul (オーバーホール) is the Quirk used by Kai Chisaki.

Description
Overhaul gives Kai the ability to disassemble and then reassemble matter with his bare hands.

Once Kai takes a target apart, he has the option of either leaving it destroyed, restoring it to its original form or shaping it into something new. This process happens instantly and is effective on living and non-living things alike. Kai just needs one finger to make contact with something for his Quirk to activate, with the choice of whether Overhaul should affect only one select part of his target or its entirety being left solely to Kai's wishes.

Kai is capable of deconstructing matter and reconstructing it into shapes favorable to himself and hostile to his enemies. When activating Overhaul on an entire area, the deconstruction and reconstruction phases both happen extremely fast. Kai is able to form holes, walls, spikes, and platforms anywhere in his surroundings from a single point. This tactic, however, loses effectiveness in fractured terrain, where the ground is split into disconnected pieces instead of whole.

Kai can recombine two different objects or beings into a single entity that possesses components of both subjects (including Quirks). He performs this by holding both elements he wants to merge with each separate hand. It's possible for a combined entity to further transform as well, as long as Kai merges it with additional objects.

When Kai decides to utilize Overhaul on a person, he can heal any injuries or ailments they once had by reconstructing them to a biologically perfect state. This grants Kai a way to cure his and his allies' wounds during a battle, although he has noted that the deconstruction phase is very painful.

Weaknesses
Overhaul can be restrained if Kai becomes unable to utilize his arms. After Atsuhiro Sako and Tomura Shigaraki destroyed his arms, which are also his Quirk Factors, Kai is now unable to activate his Quirk. To be able to use Overhaul, Kai must physically touch something. This makes Overhaul useless in the air or where he cannot touch anything. Overhaul also has a short “cool down” in which he cannot reassemble or disassemble things in that short time frame.

Usage
Kai's main usage of Overhaul outside of battle was obtaining DNA samples from Eri, which was realized by destroying her body, collecting some of her remains, and reassembling her back to life. Because Eri had access to a Rewind Quirk, Kai was able to experiment on her blood, transforming it into an ingredient for a special drug that could reverse a target's Quirk Factor, resulting in his target to be Quirkless.

Following the Yakuza tradition of covering the trails of their crimes, Kai cleaned up his illegal actions by disassembling his targets first, taking what he needed from them and restoring their bodies to perfect condition in the end, thus avoiding incriminating evidence of violent assault from being left behind. This same tactic was employed by Kai to recruit members to his organization.

In battle, Kai focuses on quickly dissembling his targets to kill them, or reshaping his terrain into a barrage of spikes. He may reshape the ground to maneuver himself around and block incoming attacks. This ability to instantly rearrange his vicinity gives Kai several methods of dealing with an opponent, making him a massive threat from any range.

After overhauling himself and Shin Nemoto, Kai revamped his own body into a monstrous form, and had access to both his Overhaul Quirk, as well as Shin's own Quirk, Confession. This transformation granted Kai increased power, speed and an extra set of arms through which Kai can activate his original Quirk, showcasing a higher magnitude of control of the said power. He would later repeat this tactic with Rikiya Katsukame, taking advantage of his grown body to increase his abilities even further.

As Kai suffers from mysophobia, the resulting gore that's sometimes left by his Quirk's deconstructing process might trigger a nervous reaction from him if it ends up spilling on his body or clothing.

Trivia

 * Overhaul is very similar to Decay in practice, but there are some key differences:
 * While both abilities are capable of destruction, only Overhaul has access to reconstruction, giving it more natural versatility.
 * Decay's effects can spread to anything connected to a target. Overhaul's effects are limited to the target only.
 * Against a human opponent, Decay's effects will keep spreading throughout their body with no way of stopping it save for mutilation of the affected area. Overhaul's effects happen instantly and can be contained within a specific body part.
 * During the time Tomura first met Kai, the former needed to touch the target with all five fingers, while just one finger was enough for Overhaul to activate.

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