the sword styles:

Muso Jikiden Eishin-ryu focuses on iaido. Iaido, derived from iaijutsu, develops the samurai skill of drawing the sword and cutting in the same movement, rather than cutting from a traditional stance after already having drawn the sword. Iaido aims to cultivate spiritual harmony in addition to the battlefield skill of iaijutsu. Eishin-ryu contains sitting techniques, standing techniques and techniques for use against multiple opponents, as well as for use on terrain.

Tenshin Shoden Katori Shinto-ryu remains the oldest surviving school of Japanese swordsmanship. According to Koryu, an index of traditional Japanese martial arts, Katori Shinto-ryu dates to 1447 and has had 20 headmasters based in Japan. The style encompasses training in the use of the katana, the bo staff, the halberd-like naginata, the spear and in empty-hand combat through jujitsu. Katori Shinto-ryu headmasters enjoy the status of Living National Treasures of Japan.

Ono-ha Itto-ryu's name translates to "one sword." The underlying principles of the style, and the branches of Itto-ryu that followed it, rely on a single powerful cut to defeat the enemy. According to Fighting Arts, Ono-ha Itto-ryu curriculum has over 150 techniques, many of which involve a direct downward cut through the center line of the body, often using the wrists as a target during their raised position when ready to attack. Modern kendo, the sport form of kenjutsu, derives its underlying philosophy from Itto-ryu.

-Eight Traditional Sword Fighting Styles for a Samurai - SportsRec

Martial arts

Krav Maga: This lethal martial art style was the first time developed by Israeli Defense Force. It was deliberately created to inflict as much harm and pain as possible to the opponent. It was created to end the life of your opponent. It is the deadliest and offensive martial art in the world.

Ninjutsu: This martial art style focuses on assassinations, espionage, and unconventional warfare. Persons who have practiced this martial art are referred to as "Non-Human". Ninjutsu is also called Ninjas. The purpose of this deadliest martial art is to kill your opponent with surprise and silently.

Classification

Human: God, SS, S, A, B, C, D, E, F

Beast: Apocalypse, SS, S, A, B, C, D, E, F