Setsuna

is the deuteragonist in the anime series Hanyō no Yashahime.

History
Setsuna is a half-demon demon slayer who works under Kohaku. She was separated from her older twin sister Towa when they were both 4 years old and was presumably raise by Kohaku and trained to become the next generation of demon slayer. However, 10 years later but was reunited with her after traveling to the future with her cousin Moroha.

It appears Setsuna at some point suffered from some sort of sleep-related childhood amnesia due to consuming the dream butterfly, which causes its consumer to neither have dreams nor sleep.

Personality
She has a calm, unflappable personality much like her father, Sesshōmaru.

Physical Description
Setsuna has dark brown hair with a hint of red, and purple eyes.

Powers & Abilities

 * Time travel:
 * Enhanced Condition: Like almost all half-demons, Setsuna's physical powers are on a significantly higher level than those of humans. Even as a small child, she was able to jump from a high tree unscathed, and throw her sister Towa several meters through the air with one hand thrust. As a teenager she can now jump very high and wield her weapon with massive strength.
 * Sleep deprivation: Setsuna has consumed the Dream butterfly, due to which she can neither fall asleep nor have dreams. Due to this reason she has forgotten her elder sister Towa. She claims this helps her stay alert in the warring age(Sengoku)

Equipment

 * Naginata: A pole weapon made of wood with single curved-blade at the end. She can use it to make a massive vortex of wind by spinning it fast above her head.
 * Golden Rainbow Pearl:

Moroha
Moroha is her paternal half-cousin.

It is clearly implied that Moroha and Setsuna do not know each other at all, and therefore do not know that they are half-cousins. Setsuna found Moroha guilty of attacking the village. And she didn't even know that Moroha was a half-demon, and was surprised when she used sacred arrows.

Towa
Towa is her twin older sister.

From episodes 1-2, it seems that they were quite close and never were apart from each other growing up. However, after Towa was time traveled to the modern era, Setsuna has seemed to not remember her sister and the bond they share when she and several others traveled at the end of episode 2.

Sesshōmaru
Sesshōmaru is her biological father.

Inuyasha
Inuyasha is her paternal half-uncle.

Kagome Higurashi
Kagome Higurashi is her half-aunt-in-law.

Trivia

 * Setsuna is the only known demon slayer who is not a full human.
 * Unlike most of the others hanyō, including her paternal uncle Inuyasha, Setsuna had no visible physical indication of being a half demon, such as dog ears. However, she has a mokomoko that crawls from her right shoulder and splits in two in the middle of her back.
 * Despite being an Inu-hanyō like her uncle Inuyasha, she and Towa seem to age at the same rate as humans.
 * Setsuna cannot fall asleep due to consuming the dream butterfly.
 * Setsuna's name, like her sister Towa's, is homophone with a time word, "moment" or "an instant". This is probably an allusion to the fact that both sisters travel through time.

Quotes
To be added