Compared to the beginning of Tokyo Ghoul, Ken Kaneki has changed dramatically. Most recall his first big shift when, after being tortured, Kaneki's hair turned white and his personality changed drastically. However, that transformation was far from his only one. With every major event in the tragic hero's life, Kaneki's outlook and actual appearance morphed to fit his new normal.
Source：https://www.cbr.com/tokyo-ghoul-how-many-kanekis-are-there/
