Another joke has found new life in smartphone RPG Fate/Grand Order. Type-Moon has a history of going all-out for their April Fool's gags, and in 2013 they presented Saint Seiya mini-visual novel Back Alley Satsuki - Chapter Heroine Sanctuary, in which Bronze Heroines Satsuki, Riesbyfe, Sion, and Ciel (from Tsukihime), along with the Saber-hunting "Mysterious Heroine X," climbed through the twelve palaces of the Gold Heroines. Now Ms X is back as an Assassin class servant for F/GO in time for the "Saber Wars" event.
Art for the character is provided by BUNBUN. According to Sword Art Online illustrator abec, BUNBUN and abec are neighbors, and aren't the same person despite what style similarities suggest. According to Kadokawa's Taiwan branch, they are the same person. BUNBUN also has a history of subbing for abec at events, possibly owing to the fact abec is (or has said they are) a girl who was in high school when SAO debutted. BUNBUN is also certainly very active promoting abec's work online too.
"Saber Wars: The Caliburn Awakens" features a limited gacha 5★ (SSR) Mysterious Heroine X, along with a chance to obtain 4★ (SR) Artoria Pendragon [Lily].
Featured servants include the game's previously introduced Sabers, Altera, Artoria Pendragon, Artoria Pendragon [Alter] (Saber), Artoria Pendragon [Lily], Okita Souji, Gaius Julius Caesar, Siegfried, Gilles de Rais (Saber), Chevalier D'Eon, Mysterious Heroine X, Nero Claudius, Fergus Mac Roich, & Mordred.
Craft Essences include
Crimson Fortress of Shadow
Mikotto! Bride Training
Star of Artoria
BUNBUN previously worked with Type-Moon, illustrating their light novel Fire Girl, as well as
That Fate/Grand Order Rider is Alexander as a young Macedonia prince, voiced by Maaya Sakamoto