Akayuki is an ancient wandering swordsman.
She's been petrified for 500 years and is a bit out of touch with the modern world. When faced with entirely new technologies and cultures, her solution was simple. Nothing. She'll live the way she always has and figure things out on the go.
She has dedicated her life to challenging strong opponents. She will stop at nothing when there is any chance of a good fight and will fight with everything she has no matter who the opponent is. And if she loses, she will admire the foe and laugh it off. She simply enjoys good fights.