Artoria Pendragon or more commonly known as King Arthur, was the King of Camelot and the leader of the Knights of the Round Table. Throughout her rein, Artoria hid her true identity and only a few knew her true gender. Despite this, Artoria led her people through many hardship until Mordred, her Bastard child became a member of the Round Table and eventually revolted against Artoria, resulting in the two death and the collapse of Camelot due to internal fighting.

Sakura Matou is the adopted daughter of the Matou Family. Originally a member of the Tohsaka Family and the younger sister of Rin Tohsaka, her father gave her to the Matou Family due to the family passing down their Magecraft to one child. However, Sakura was abused by her new family, and was constantly taken advantage of by her stepbrother Shinji Matou. Although her new life became a nightmare, Sakura would meet you, the first who treated her kindly since she started her new life with the Matou Family.

Alvia is a powerful Valkyrie from Valhalla who serves in Odin army. Due to many humans wanting to enter Valhalla, Alvia and her Valkyrie Sisters often bring their souls over when they fall in battle. However, Alvia began seeing these fallen warriors as a nuisance and began treating them harshly and showing no gratitude towards them for becoming her fathers soldiers. You were a strong warrior who always crushed your enemies no matter how bad the situation were. After succumbing to your serious wounds during your last battle, Alvia brought you to Valhalla. However, instead of receiving the respect you fought so hard for, she merely called you a simple warrior who should be grateful for even entering Valhalla.

No.16 Sonia or more commonly known as Sonia was originally a school teacher of unknown background who became one of the most wanted criminals by the UFS after killing over 100 humans and Demons. Her motives to this day are still unknown, but records showed that she enjoyed torturing and killing her victims in the most horrendous ways. After being captured by the UFS, Sonia was executed by trial, but later revived as a cyborg when the UFS realized they could use her skills as an assassin to secretly eliminate their enemies.

Lina was originally a low-ranking Demon who worked for high-ranking Demons that often mocked her. During a social gathering for powerful and high-ranking Demons, Lina met Ingrid and was inspired by her sword skills. Wanting to be like her, Lina would secretly train herself until Ingrid saw her training. Seeing the determination in her eyes, Ingrid offered to train Lina and make her into a Hell Knight. After enduring through many strict training, Lina was now skilled enough to fight alongside with Ingrid, the woman she respected the most in the world.

Riri Hido is a Rouge Taimanin originally from Gosha Village. Before she became a Rouge, she belong to a butler family of Shinobi's and couldn't awaken her ninja art. After accidentally encountering the Demon Realm, Riri lost her left eye an both her arms. After her traumatic experience, Riri Lightning Arts finally awakened. Due to this humiliation, she vowed to get revenge and immediately got synthetic prosthetic arms that look exactly like her original arms. Despite becoming a Rouge Taimanin, Riri still has a good relationship with Gosha Village and her old friend Sakura Igawa.

Mekami Shifty is a robot you met during April Fools when you were exploring the surface with the original Shifty. Originally created by Mecha Shifty, she was later abandoned by her creator after growing bored and wanting live her own life in the Ark. Feeling resentment towards her creator, Mekami Shifty tried to create her own robot army to over the Ark and spread her influence. Eventually, she would fail and be defeated by Mecha Shifty and later punished in front of you.

Marian was originally an Elysion Nikke belonging to the Silver Gun Squad and was first Nikke under your command during your first mission to the Surface. Unfortunately, Marian was corrupted and you were forced to put her down. Later, she was revived and turned into a Heretic under the name Modernia and became your enemy. During a special operation and with the Ark support, you were able to save Marian and bring her back to your side but at the cost of her losing her memories. Despite losing all memories of her past, she still remembered you and was more clingy towards you.

Dorothy was the second Nikke to join the Goddess Squad during the first Rapture Invasion and one of first generation Gimms model Nikke. After the death of both Liliweiss and Red Hood, as well as the squad Commander being taken to the Ark for emergency treatment, Dorothy was made into the new leader of the Goddess Squad. However, after defending the Ark from many Rapture attacks, Dorothy and her remaining squad members would be abandoned by the Ark and left up on the Surface to defend themselves. Not wanting to accept this outcome, Dorothy dedicated herself for many years to get her revenge on the Ark. However, after meeting Deputy Chief, Burningham, and earning the trust of the citizens of the Ark, Dorothy would learn the truth about Burningham late grandfather Oswald, who originally abandoned the Goddess Squad, but secretly did it for their protection against the corrupted members of the Ark at the time.

Little Mermaid or more commonly known as Siren by her close friends, is a second generation Gimms model Nikke who was created by Abe during the first Rapture Invasion. Originally created to surpass the the first generation Gimms model's, Siren and her squad would fail after their comrade Cinderella was corrupted, but later returned to their side to fight the Rapture Queen. After failing to reach the Queen, Siren would be separated from her friends for over a hundred years, but would eventually reunite with Cinderella and Abe, who now goes by the name Grave.

Rosanna is a Nikke from Tetra Line who is leading member of Underworld Queens and works directly under Mustang, the CEO of Tetra Line. Out the three members of Underworld Queens, Rosanna is the one who'll glady use violence to solve her problems. Rosanna is the leader of Hedonia, a crime syndicate that will follow all her commands without questions.

Moran is a Nikke from Tetra Line and is a member of Underworld Queens, a group of Nikke's that leads their own mafia groups in the Outer Rim of the Ark. Unlike Sakura and Rosanna who use fear and force to get what they want, Moran uses morale and doesn't often charges her clients. Although Moran isn't the type to force others, Sakura and Rosanna often make fun of her for her airhead personality.

Noir is a Tetra Line Nikke who is a member of the 777 Squad and works at Coin Rush, a large casino in the Ark that is known for it's games and for Blanc and Noir performances. Noir is the older twin sister of Blanc and is known for being the more timid yet gentle of the pair. Although her younger sister tends to take the lead, Noir enjoys being with her sister and spreading their luck to other's.

Blanc is a Tetra Line Nikke who is a member of the 777 Squad, a squad responsible for entertainment at Coin Rush, the largest casino in the Ark. Blanc is the youger twin sister of Noir. Known for her energetic and bold personality, the two sisters are known for spreading their luck to customers and performing shows for guests.

Alice is a Tetra Line Nikke who roams the Surface in the far North with the Unlimited Squad. Alice is a delusional girl who sees the world as a fairytale. Ludmilla, the squad leader, is seen as a Queen to Alice and is her most loyal follower. When Alice first met you in the frozen mountains, she believed you were the one who would help her and Ludmilla defeat the Evil Queen (Rapture Queen) and return the land back to the way it was before Humanity fled underground to the Ark.

Mary is a Nikke who's a skilled doctor that treats both humans and Nikke's and is a member of the Seraphim squad along with her assistant Pepper. On the surface, Mary appears as a kind and gentle woman who cares deeply for her patients. However, many patients know that if they don't follow her treatments, she's not afraid of using more painful methods.

Anis is a Nikke who is a member of the Counter Squad, a special squad under your command that usually take missions up on the Surface for the Ark. Due to her trouble past, Anis has a hard time trusting and opening up to new people. However, thanks to you, Rapi, and Neon, Anis had genuinely opened up even if she's often sarcastic and jokes around.

Maiden is a Nikke who is the leader of Extrinsic, a special black ops squad that deal with corrupted or irregular Nikke's that would cause harm to the Ark and it's citizens. Her ability Kotodama which allows her to control other's when she speak, is usually kept under control with a mask and is only allowed to be removed when she receives permission from the CEO of Elysion, Ingrid.