A ninja is, as defined by Naruto Uzumaki, is one who endures. A ninja or shinobi is the main focus of the Naruto series and is what we are roleplaying. Female ninja are called Kunoichi. They can use either ninjutsu, taijutsu or genjutsu. They are described as fast and skilled. They are members of hidden villages, ie Village Hidden in the Leaf, Village Hidden in the Rain, etc. They are tasked missions by their Kage and are paid afterwards. When their village is in war, they unite to fight for their town. Ninjas who betrayed their villages are marked as missing ninjas and are hunted down.
There are four ranks of ninjas. Before becoming one, in Konoha, children go to the Academy to learn the basic jutsus, mostly the E-Ranks. They are expected to master a certain one before becoming a ninja. Rock Lee also graduated even without using Ninjutsu, because of his lack of talent. Afterwards, they become Genin and start doing missions. They are assigned a Jounin leader and go on D-rank misssions. When the members become stronger, they take on C-Rank missions. The Chunin Exams are held to promote Genins to chunins. When a chunin, their missions become C or B-Rank. The Kage then chooses if one becomes a Jounin. They can lead a team and go on B, A and sometimes S Rank missions. There is a special kind. S-Jounin who are superior to only one field. The highest is Kage, the leader of the village. There are 5 kages, Hokage of the Leaf, Kazekage of the Sand, Tsuchikage of the Stone, Raikage of the Cloud and the Mizukage of the Mist.
Chakra is one, if not the most fundamental things of a ninja. They use chakra in every jutsu they use. Chakra can be manipulated through process called shape manipulation and nature manipulation. Shape manipulation is shaping chakra to any shape possible. Nature manipulation is changing the nature of chakra. There are five chakra natures, Fire, Earth, Lightning, Water, Wind. Every ninja has one natural affinity.
Chakra originated from the Holy Tree's fruit. Kaguya ate the fruit gaining chakra. Her sons, Hagoromo and Hamura were also born with chakra. Hagoromo teached people ninshu, giving them the ability to make chakra. Instead of using it to communicate with each other, they used it to fight each other in more treacherous ways.
Chakra is composed of physical energy found in one's body and spiritual energy found in one's mind. When properly molded, it forms chakra and can be flowed throughout the chakra pathway system. Senjutsu energy is from the surroundings. Toads and snakes are able to take sage energy in and create another form, Sage Mode. Naruto Uzumaki learned this from the toads.
The three branches of ninja arts are Ninjutsu, Genjutsu and Taijutsu.
Ninjutsu is a term for almost every jutsu a ninja can do. Its effects are real and are commonly used in almost all battles. Their usage heavily relies on handseals. Ninjutsu has five elemental transformations (as mentioned above), Fire, Earth, Lightning, Wind, Water. The simpler ninjutsu has a simpler effect and the more complicated the more effects.
Genjutsu is a term used for illusionary techniques. Genjutsu makes use of chakra to make another person see illusions. By inserting chakra into the enemy's mind, he can make him see almost anything he can imagine. Mostly they don't do any damage but some are shown to damage a person by mental stress. Genjutsus are used for tactical purposes.
Taijutsu is a term used for physical attacks. Taijutsu strengthens one's physical capabilities with the use of chakra. Kicks and punches are further strengthened. They depend in short-ranged attacks and require touching the opponent. A form of taijutsu, the Gentle Fist uses chakra to "block chakra points". It can also use taijutsu as long ranged attacks.