Overhaul (Quirk)

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

Description
Through Overhaul, Kai is able to disassemble and then reassemble anything he makes physical contact with, turning it back into its original state or a completely different one.

Whenever Kai touches someone or something with either of his hands, he may destroy it instantly, either entirely or partially. After the destruction is completed, Kai has the option of reconstructing what he just destroyed. In the case of living beings, any injuries or ailments they once had may be cured during the reconstructive process, giving Kai a way to heal his own body or someone else's (although this method of healing is noted to still be painful). For objects, Kai can rearrange his immediate terrain, turning it into something favorable for himself and hostile for his enemies.

The reconstruction aspect of his Quirk also means that Chisaki 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 combine with each separate hand.

Because Overhaul is activated through Chisaki's hands, having them amputated from his body turns the Quirk effectively useless.

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, turning them Quirkless. With Eri out of his clutches, Kai is unable to perform this anymore.

Kai utilized Overhaul to clean his escape tracks several times. Because the Quirk could be used to disassemble and then reassemble victims, Kai could simply destroy targets first, get whatever he wanted from them and finally restore their remains to a perfect condition, thus avoiding murders and evidence of incriminating practices. To escape Sir Nighteye's operation, Kai modified the underground maze he was traversing, creating walls to stop pursuers.

After using Overhaul on himself and Shin Nemoto, Kai revamped his own body into a monstrous form, who had access to both this Quirk as well as Shin's. This form granted Kai increased power, speed and an extra set of arms for him to activate his Quirk through. Later, he would repeat this tactic with Rikiya Katsukame, taking advantage of his grown body to increase his abilities even further.

Since Kai wears surgical gloves all the time, he needs to remove them first before attempting to use Overhaul, although he can just destroy them directly if angered enough. Also, as the destructive portion of Overhaul often results in high amounts of gore when used on people, it may trigger Kai's mysophobia if blood splatters on his body.