xAr4m1s

I mean that when Sharingan uses, nobody realizes that their eyes change color

He is supposed to be dead, dies before the start of the canon. 4 months

Unless your name is Noro and you have an absurd regeneration

Why doesn't he buy contact lenses?

Hinami's mother was also very stupid. She was told she was being watched, and the first thing she did was bury her husband's ghoul mask (which Amon discovered). She also didn't tell Hinami that her father was dead. She was a child, yes, but she was a ghoul, and she probably knew how to differentiate between life and death. This ultimately backfires on her when she smells her father, which turns out to be a trap.