BlazBlue Alternative: Dark War (ブレイブルー オルタナティブ ダークウォー BureiBurū Orutanatibu Dāku Uō) is a free-to-play role-playing game announced for the iOS and Android systems. However, the game will shut down services on January 31, 2022. 
This is a story leading to the Blue.
When taking just a step from the usual calm, the world begins to end…
The Hell, with the name of a possibility, begins.
- The protagonist (Rei) — the character chosen by the player, either male or female.
- Ciel Sulfur — a mysterious girl who belongs to the Mitsurugi Agency.
- Astrolabe (Raabe) - an Independent Thought Unit with a personality based on Kagami Hajou. Raabe assists the protagonist and Ciel Sulfur with their dives into Phantom Fields.
- Kagami Hajou - a member of the Mitsurugi Agency who guides Ciel Sulfer and the protagonist. She's also a shopkeeper in the player store.
- White Justice - similar to how Hakumen is the alternate future counterpart of Jin Kisaragi from a destroyed Calamity Trigger timeline, this warrior is the alternate counterpart of Tsubaki Yayoi, who briefly appeared in the ending scenes of BlazBlue: Centralfiction.
- Another Dark Mai - A Possibility of Mai Natsume that has a "calamity factor" included in her existence. Fighting has become her reason for living, and she is currently acting on behalf of a certain someone.
- Another Dark Kagura (Limited)
- Jin Kisaragi — a Major-class soldier of the 4th Division belonging to the World Void Information Control Organization. He’s a member of the Twelve Originators’ Kisaragi family, and the next head of this household. He wields a powerful Arch-Enemy Event Weapon, the Ice Sword: Yukianesa.
- Noel Vermillion — a Second Lieutenant-class soldier of the 4th Division belonging to the Control Organization. She’s a secretary of Jin Kisaragi – a Major of the mentioned division. She wields a powerful Event Weapon, the Demon Guns: Bolverk. (also in Academy & Holynight Guardian (Christmas))
- Holynight Guardian (Limited)
- Rachel Alucard
- Iron Tager
- Litchi Faye Ling
- Bang Shishigami
- Nu-13 (as Jussan) (Limited)
- Tsubaki Yayoi — a First Lieutenant-class soldier of the 0th Division belonging to the Control Organization. She’s a member of the Twelve Originators’ Yayoi family. Noel is her close friend from the Military Academy.
- Makoto Nanaya- a soldier of the World Void Information Control Organization and their Magic Formula Troops. She is close friends with Tsubaki and Noel from the Military Academy.
- Valkenhayn R. Hellsing (BE)
- Platinum the Trinity
- Beachside Magical Girl (Limited)
- Relius Clover (BE)
- Bullet — a person from the Resistance Central that is against the tyranny of the Control Organization. She was raised in an all-male mercenary group that later gets completely wiped out – it made her hostile against the organization.
- Kagura Mutsuki
- Yūki Terumi (Spirit Body)
- Celica Ayatsuki Mercury
- Lambda-11 (Limited)
- Konoe Mercury (PS) (Limited) — a Magic Association Academy student, a skilled conjurer in the Magic Association, soon to be appointed as the ninth of the Ten Sages.
- Hibiki Kohaku
- Mai Natsume
- Midsummer Fairy (Limited)
- Tenjō Amanohokosaka
- Homura Amanohokosaka
- Kajun Faycott
- Kazuma Kval — a student from the academy in the Magic City of Ishana,
- Trinity Glassfille — a student from the academy in the Magic City of Ishana. She’s an excellent conjurer and an alchemist – because of this, she’s also called Platinum the Trinity or Platinum Alchemist.
- Es (Limited)
- Mei Amanohokosaka
- Kuon Glamred Stroheim
- Scorching Beach Attacker (Limited)
- Sechs (Limited)
- Ragna the Bloodedge
- Saya Terumi (Summer, concept art)
- Akira Kamewari
- Clavis Alucard (BE)
- Valkenhayn R. Hellsing (PS)
Cameo as Grimoire
- The game was initially meant to release in 2018 for iOS and Android, but was delayed until further notice, even though preregistrations passed the 20000s.. It was confirmed to be still in development by 2019
- The gameplay is planned to be relatively close to, or at least in reference to the fighting games, . It also includes gachapon mechanics.
- Promotional material featured art for characters beyond those in the initial announcement, like Nu-13, Hibiki Kohaku and Bullet.
- Ragna the Bloodedge was originally gonna be released around December 28, 2021 nearly a month before the service end the game. 
- BlazBlue Alternative: Dark War main page
- BlazBlue Alternative: Dark War, prolog, “one emerging possibility”