"Take over the universe? Stick to obnoxious outfits, not obnoxious plots. I'm not letting that happen."
- ―Asuna, to Gina Spectre
As a child, Asuna was given a Kendo training by her father and became the strongest in her district. She also had a childhood crush but accidentally made him cried after winning a Kendo match against him.
According to a TV show, she graduated from a local high school, then joined Xio as a cadet and her excellent performance led her to be promoted to the investigation team. She admitted she joined because she didn't want something like the Earth's safety in the hands of men and would have ended up like an ordinary girl if she didn't join Xio
In the present day, she is partnered with Daichi during missions. While always act cold towards Daichi, but she grew a soft spot towards him over time.
Abilities and Arsenal
- Peak Human Condition: Asuna is a skilled martial arts practitioner due to her past being taught self defense by her father.
- Piloting: Asuna is a skilled driver in heavy vehicles like Xio Porthos and Land Musketty.
- She shares the resemblance to Yuuki Asuna/Asuna from the light novel series, Sword Art Online. As shown:
- Both share the same first name.
- Both originally acted cold towards main character until they grew a soft spot towards them.
- Both had parents who wanted to make them into a figure of their own image, that later positively affected them.
- Asuna Yamase's father had her learn martial arts and due to this, she loses her first crush when defeating him in a Kendo match.
- Asuna Yuuki's mother wanted her to experience a luxurious life in of her mundane past life, thus if she chooses to, she would lose the chance to marry Kirito or meeting her regular friends.