She specializes in Ninjutsu: a technique created through the combination of Nen, Chakra, and inherent Dark Elf magic.
Kunoichi take their payment for protecting royals and nobles not in the form of wealth, but as being worshipped as familial guardians. As such, they carry out duties such as guarding important persons or infiltrating enemies to collect information.
Learning to control fire requires painstaking training, so it is taken for granted that one adept in such skills possesses great patience and fortitude.
As they rarely reveal themselves to the outside world, Kunoichi are often thought of as mere myths or beings that exist only in legends.