Her rash attitude comes from having to live a "hard-working" double-life of a human and ghoul identity. As a human, she is seen as a normal girl attending school with normal friends and being a café waitress. As a ghoul, she reveals a more reckless and ruthless personality full of hatred for CCG's investigators. This stems from the fact that her family was torn apart by CCG and she had to live a fugitive life until leading a more docile life by attending school. After being separated from her brother Ayato, she grows to appreciate her human life and starts to desperately hold onto it. As Shuu Tsukiyama notes, she had previously looked more dangerous and cold but has somewhat softened up because of her friends and possibly Ken Kaneki's influence. When Touka was fourteen years old, she expressed a much colder demeanor, and displayed a harsh glare, but these traits subsided over the years.

Touka suffers from ornithophobia. This may have stemmed from caring for a bird when she was a child only to be pecked near her right eye that she then covers with a hair bang.