Shigaraki, Tomura

In the chapter 92, it is revealed that Shigaraki Tomura is the grandson of Shimura Nana.

Each pair of the hands he wears on his body originally belonged to an individual killed by Shigaraki during the time his Quirk first manifested: the one on his neck is his mother's; on his arms, his grandfather's; on his forearms, his grandmother's; on his wrists, his sister's; and the ones in his chest and shoulders are from two unnamed street punks. The hand that holds and hides Shigaraki's face, and that he sometimes keeps in his pocket, is his father's left hand, called "Father" by him.

Later on, Shigaraki changed his goal to instead, destroy society all together rather than reshape it. He soon merged his organization and the Meta Liberation Army to form the Paranormal Liberation Front, becoming its Grand Commander and later inheriting the All For One Quirk.

After becoming leader of the Paranormal Liberation Front and earning the respect of Gigantomachia, Kyudai Garaki subjected a willing Shigaraki to body modification surgery. While the details of this surgery and its effects are unknown, the doctor believes that it will allow Shigaraki to surpass the strength of One For All.

The modifications allow him to drastically amplify the power of his already awakened Decay Quirk, giving him the ability to disintegrate masses as large as the entire Jaku Hospital, a portion of the surrounding city and the nearby forest and mountains in one fell swoop.

It was later revealed that Shimura Tenko was never born with the Qurik, Decay but rather some other Qurik that was replaced by All For One with Decay before manifesting at a very young age. Moreover, the Qurik, Decay was actually created by All For One by copying Chisaki's Overhaul and 'splitting it in half'

(Source: Wikipedia, My Hero Academia Wiki)