“Now, how many years ago was that?”
Klein, being at least around 100 years old by now, has had a long life (for human standards) and had a childhood in a time very different from now. Like any young cat sith (kitten sith?), she went to an academy to learn magic, eventually also learning how to wield a rapier. Quick and smart as a child, many teachers and parents expected a lot from her, and although she was at first a bit shy at people labeling her as a prodigy, she grew fond of the attention and used it often as a way to boast.
She was a quiet child, but she was also prideful. The kind of kid that keeps their head down until someone says something about them. The only thing sharper than her tongue was her sword, and anyone who messed with her would quickly find themselves at the other end of the blade.
Adolescence was an interesting time for Klein, who acted double that of her younger self, swinging at offenders left and right while keeping a calm expression. Pride was still the centerpiece of her personality, and if anyone harmed it, she’d ensure that they swallowed their words. Pride caused her to lose a significant number of her childhood friends, and she came to realize that in the end, her pride may have been her greatest weakness. With a tight group of just a few friends, she finished her time at the academy and set out to represent her fellow Cat Siths in the Mogwai army... until a pesky Conjurer decided to show up.