All For One renames the boy Tomura Shigaraki , with "Tomura" signifying "to mourn" and "Shigaraki" being All For One's own surname, marking him as his official successor. The Battle in Deika City
In the present day, Shigaraki faces off against Re-Destro, the leader of the Meta Liberation Army (MLA). Boku no Hero Academia 5th Season (Dub) Episode 24
Despite using his "Claustro" mecha suit to push his Stress output to 150%, Re-Destro is overwhelmed. He is forced to amputate his own legs to stop Shigaraki's decay from spreading to the rest of his body. All For One renames the boy Tomura Shigaraki
The episode ends with a significant shift in the series' power balance: Boku no Hero Academia Season 5 - Episode 24 discussion He is forced to amputate his own legs
All For One encourages Tenko to embrace his destructive urges, telling him that his internal "itch" is his power overflowing.
The massive beast Gigantomachia arrives on the scene, finally acknowledging Shigaraki as a worthy successor to All For One. Formation of the Paranormal Liberation Front