Kasane Randall is a cool and pragmatic girl who acts indifferently to others but has unparalleled sense of battle. She joined the Other Suppression Force after being scouted. She graduated OSF training at the top of her class.

Kasane lost her parents to an Other attack when she was younger. Subsequently, she was adopted by the Randall family. The Randall family operates the military contractor, Randall Industries. Her adoptive parents have never treated her like a real daughter and disciplined her harshly. Kasane has a deep emotional attachment to her adopted sister Naomi. She was the only one who showed her any kindness to Kasane grow.

The hairclip she wears was given to her as a matching pair by Naomi when they were young. This is the "proof" that they were sisters and is Kasane's most treasured possession.