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Karate is a type of martial art developed in the Ryukyu Islands, developed from indigenous fighting methods called "te" (手, literally "hand") and Chinese kung fu. A karate practitioner is called a "karateka". In addition, a karateka usually gives the greeting of "O, Osu (お、おす)"
Karate is primarily a striking art which uses punching, kicking, knee and elbow strikes, and open-handed techniques such as knife-hands and ridge-hands. Grappling, locks, restraints, throws, and vital point strikes are taught in some styles. Karate can be practiced as budo (self-development), as a sport, as a combat sport, or as self-defense training; Traditional karate places emphasis on budo. Modern Japanese style training emphasizes the psychological elements incorporated into a proper kokoro (attitude) such as perseverance, fearlessness, virtue, and leadership skills. Sport karate places emphasis on exercise and competition. The use of weapons are a important training activity in some styles.
Although Luna, who had debuted in the Xtreme series, is not known to have a fighting style of her own, it is implied in her meeting Hitomi in Messenger of the Moon that she was at least familiar with the concept of Karate, since when talking with Hitomi, she briefly gives the Karate greeting.