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| (十二月, Jūnigatsu; Literally meaning "Twelve Months")
|Date Created||January 1|
"How many months are in one year ? Twelve months ? Wrong, is Thirteen."
Jūnigatsu (十二月, Jūnigatsu, literally the "Month") also known as the Gatsu for short and Fantomu Ansatsu (幻の暗殺者, Phantom Assassins) because the organization consisting of solely the greatest assassins, all of them are S-Class shinobi. There can be thirteen members at one time because there are only 13 Month Stones. These artifacts were hold by the members. The artifacts provide some secret power for the user and the powers are not arranged by the month arrangement. However, the powers are still unknown.
Month Stone are artifacts first found in Temple of the Sea (海の宮, Umi no Miya) along with the other artifacts by many researcher who are friends. Due to quarrels, the artifacts are divided between them. The researcher's descendant who inherited the Month Stones has created this organization.
Month Stones are artifacts which contain different hidden powers in each of them. The artifact took the shape of plate and black color which have the white color number carved on them. To use the power, first the artifact must be hold by them; it can done by wearing it. When the Stones lived with a person for a long time, it will naturally chose the user as master and after that, it will follows where the user go just like the relation of Earth and Moon. The numbers of Month Stones are ranged from January to December with an extra Trivember which means the Thirteenth Month.
Suiteki Mizuko (水滴 水子)Edit
The First Gatsu of Jūnigatsu with the possession of First Month Stone, January. She is widely known as Sea Wave Empress (海波の女王, Umiha no Joō) because having the ability of attracts and duplicates liquid. This ability is granted from her Kekkei Genkai and it is said that her strength and power is comparable to Kage. Despite her young appearance, she is the leader of Mortales.
Ankoku Kiryū (暗黒 桐生)Edit
The Second Gatsu of Jūnigatsu with the possession of Second Month Stone, February. He is a Akakaminari user, a Kekkei Genkai inherited from Kiryū Clan. He is widely known as Red Lightning Sword Emperor (赤雷の剣帝, Akakaminari no Ken Mikado) after created the sword style. The reason he join the organization is he want to become stronger so he can take revenge at the irresponsible ninja who destroyed his life in Sunagakure.
Yukimura Asuka (雪村 明日香)Edit
The Third Gatsu of Jūnigatsu with the possession of Third Month Stone, March. She is a Tenshiying user, a Kekkei Genkai inherited from Yukimaru Clan. She is widely known as Fallen Angel (堕天使, Datenshi) which represents that she was once an angel but now is banished. The reason she join the organization is she want to revenge against Takigakure who took her mother life.
Fantomu Shiro (幻影 白)Edit
The Fourth Gatsu of Jūnigatsu with the possession of Fourth Month Stone, April . He is an expert Seishogan user, a Dojutsu inherited from Fantomu Clan. He is widely known as Phantom Soul Assasin (幻魂の暗殺者, Fantomu Tamashi Ansatsu) after countless of murdered case he did. The reason he join the organization is attracted by the organization's objective, "Peaceful World".
Shinrin Shōkaze (森林 小風)Edit
The Fifth Gatsu of Jūnigatsu with the possession of Fifth Month Stone, May. He is a Choten'i user, a Kekkei Genkai inherited and apparently the last survivor from Shinrin Clan after the disaster landed on his village. He is widely known as Matter State Alchemist (物質状態の錬金術師, Busshitsu Jōtai Renkinjutsushi) after he mastered his Kekkei Genkai which allowed him to manipulate the state of matter. The reason he join the organization is he want to stop the world from dying.
Bakura Rei (獏良 霊)Edit
The Sixth Gatsu of Jūnigatsu with the possession of Sixth Month Stone, June. She is a missing-nin from Amegakure and Storm Release user inherited from Bakura Clan. She is widely known as Storm Angel (嵐の天使, Arashi no Tenshi) after she stopped a tornado that almost destroy the one of the hidden base of Mortales. The reason she join the organization is she want to proof that she and female are not rubbish and useless.
Kuchiku Ryūsei (駆逐 流星)Edit
The Seventh Gatsu of Jūnigatsu with the possession of Seventh Month Stone, July. He lost his memory during Shinobi World War, his name for the exception. His surname is changed to Kuchiku by Asuka and Rei after they found and brought him home from the war. He is widely known as Shooting Star Dragon (流星龍, Ryūsei Ryū) due to his amazing destructive strength. The reason he join the organization because Mortales is his home, more specifically is Asuka and Rei saved him, so he decided to stay with them.
Mikado Kiyoshi (帝王 清)Edit
The Eighth Gatsu of Jūnigatsu with the possession of Eighth Month Stone, August. He is an expert in throwing knifes or shooting darts, widely known as God of Shooting (神射撃, Kami Shageki). He is probably the few survivor of Mikado Clan after the inner-war of the clan itself. The reason he join the organization is to prove he is a king, the strongest shinobi in the world.
Yangawa Heise (彦方 黑色)Edit
The Ninth Gatsu of Jūnigatsu with the possession of Ninth Month Stone, September. He has expertise in drawing, widely known as King of Arts (芸術家の帝, Geijutsuka no Mikado). He has a strange personality where not even his comrades understand him. The reason he join the organization is because he was sick of bullied and corrupted village he lived long ago.
Kyokudo Hikari (極度 光)Edit
The Tenth Gatsu of Jūnigatsu with the possession of Tenth Month Stone, October. He has extremely fast speed, even overwhelms all of Mortales member, widely known as Speed of Light (光の速度, Hikari no Sokudo). However, speed is only the best thing he got, he is weak in offense and defense. He was a S-Rank criminal even before he joined Mortales, nevertheless, he became more infamous after joined Mortales. The reason he join the organization is unknown.
Ho Yansheng (何 衍升)Edit
The Eleventh Gatsu of Jūnigatsu with the possession of Eleventh Month Stone, November. He and Guoxing are people from Rōran. Even thought not much information is known about him, he is widely known as Code Breaker (暗号ブレーカ, Kōdo Bureikā) because of his natural talent of mathematics. The reason he join the organization is to protect Rōran along with Guoxing and Junni.
Chen Guoxing (陈 国兴)Edit
The Thirteenth Gatsu of Jūnigatsu with the possession of Thirteenth Month Stone, Trivember. He and Yanseng are people from Rōran. Even thought not much information is known about him, he is widely known as Dark Magician (黑魔導, Burakku Majishan) because of his mastery of Hell Release. The reason he join the organization is to stabilize his position as the King of his land, Rōran.
Jikan (十二小时, Jūni Jikan, literally the "Time")
Seiza (十二星座, Jūni Seiza, literally the "Zodiac")
Shunsetsu (十二生肖, Jūni Shunsetsu, literally the "Chinese Zodiac")
Girisha (ギリシャ神, Girisha Shin, literally the "Greek God")
Spareta (スパルタ, Spareta, literally the "Sparta")
- Month Stones planted in the members will not disappear even after the user death but are possible to remove and plant in another member.
- Month Stone provides unique power to the user.
- Month Stones has one similarity with other artifacts which all found in the Temple. They all have extra one artifact call 13 with strange name.