Hayase (ハヤセ) is a government official of Yanome. She has acted as a reoccurring antagonist.
In her original appearance, Hayase had black hair in a bob-cut. Now, Hayase has longer hair and scars on her face and body from Fushi's attack. She has also added a ragged cloak to her outfit.
In the beginning, Hayase is generally a quiet person and takes her duties very seriously. She appears to be calm, stoic, and a bit inscrutable. Later on, her character becomes more violent and relentless.
She is shown to be skilled in combat, even more so after surviving Fushi's attack. For some reason, she developed a crush on Fushi.
Little is known about Hayase's past, however she is a Yanome government official who seems to be well respected. She was chosen to oversee the Ninannah sacrificial ceremony for the Spirit Bear.
After Fushi's attack in Yanome, Hayase spends about 5 years searching for him. She eventually meets him again on Junanda.
At some point, Hayase had a child and eventually a grandchild.