Summary
The properties of Overhaul are revealed to be a special element of Shigaraki's Decline. Overhauled in one of Dr. Kyudai Garaki's orphanages as a child. Chisaki's dark origins are tied to his experiments and twisted morals.
My Hero Academy Recent chapters have revealed the origin of Shigaraki Tomura's ability: All For One took Tenko Shimura's unknown ability element passed down from his parents and gave him Decay, an incomplete copy of the powers of one of the children in Dr. Kyudai Garaki's facility, who turns out to be Kai Chisaki, aka Overhaul.
Overhaul, a trait of Kai Chisaki, the main antagonist of the Shie Hassaikai arc of My Hero Academia, allows him to deconstruct and reconstruct anything he touches with his bare hands. This has many similarities to Shigaraki's Decay: both abilities are very powerful, are activated directly by hand, and can destroy anyone with a single touch.
This is not just a coincidence, chapter #419 points out the odd element duplicated by Dr. Garaki for Decay actually comes from Chisaki. However, Decay was designed by doctors to only leave half the destructive power by taking away the ability to reverse the effects.
The true story of My Hero Academia's villain overhaul
Chisaki was at One of Dr. Garaki's Facilities as a child.
Kai Chisaki, known as the villain Overhaul, was admitted as a child to one of the many orphanages run by Dr. Garaki. This was confirmed by a part in chapter #419 of the manga that corresponds to the part in chapter #158 where Overhaul is remembering his past. This revelation means Chisaki is considered one of the “seeds of hatred”a test subject that can be manipulated to become All for One's vessel in case something happens to Shigaraki, much like Dabi, Nine from My Hero Academia: Heroes Rising and Six from the Vigilantes spin-off .
In chapter #151, it is implied that the Yakuza Boss picked up Chisaki from the streets and raised him. But before that happens, Chisaki is forced to escape from the orphanage. That explains why he was covered in dirt and scratches when the Boss found him. The AFO probably didn't look for him because they already had a copy of his abilities and also because the children in the orphanage were just “spare items”. If Chisaki hadn't left, they probably would have turned him into an experimental villain, like the ones created in the factory in Vigilantes, or into a nomu.
The experimental overhaul was inspired by his past
Chisaki's origins give more depth to his obsession with oddities
During the section about Chisaki's childhood in the orphanage, it is hinted that he is reading a book about the true nature of quirks, stating that it is a disease that comes from rats and is very maybe that's what sparked his germ obsession and phobia. odd elements. But considering the things Overhaul may have witnessed from Dr. Garaki and the fact that he himself was a victim of the experiment, it certainly developed a twisted personality and unethical behavior of him, causing him to test Eri and put his father figure, the Boss, in a difficult position. comatose.
Overhaul lost his powers to Shigaraki (who ironically took his powers from him), and afterward, he showed no remorse for his actions, simply because he no longer can bring Boss back. Guilt causes Chisaki to lose his sanity, but even then, he has no interest in apologizing for the hurt he caused Eri. Overall, Chisaki is a villain who is completely unforgivable and completely lacking in empathy, but his dark origins give his thoughts more depth and make him a character. more interesting object. My Hero Academy character.