Close Quarters Combat: Despite being an info broker, Fuuma is a formidable opponent in close combat. As a natural born Ninja, Fuma is able to strike hard, strike fast, and strike where least expected. The best example of this would be her fight against Raika Hino, where she managed to even their strength difference by being too fast for Raika to respond
Jutsu: Fuuma seems to be capable of performing "jutsu", as lots of people would call it. Her appearance in the soccer field in the events of Volume 5 also imply that either she can use "jutsu" or she has amazing speed.
Lezzard Training: The mere fact that she is in Lezzad means that she should be a very analytical person. Her training as a ninja plays into this as in active combat she only chooses to strike percisely, often at points where the enemy would be too slow to react.
Tremor: During the soccer game in Volume 5, she performed an extremely powerful downward strike that seems to be called "Tremor". This technique utilizes all the joints in the body to make a single, powerful movement. Tohyama Kinji's own "Ouka" technique was invented after he speculated the use of this technique.