Military Uniform Princess, is the primary antagonist of the anime series Re:Creators and the secondary and last creation of Setsuna Shimazaki before her suicide, based on Shirotsumekusa (シロツメクサ) from social game Eternal Wars Megalosphere (悠久大戦メガロスフィア Yūkyū Taisen Megarosufia). Her real name was revealed to be "Altair" and she came from an online music video called Altair: World Étude. An independent existence without a story. She is responsible for bringing the Created into the real world. Her plan is to make the worlds collide by getting the characters she brought into the real world to fight thereby causing the destruction of the rationality of the real world, and to ultimately bring about great destruction and cause everything to return to oblivion.

Unlike the other Created, who are incognizant about the fact that both themselves, their experiences, and the worlds that they dwell in are considered to be fictional, much less know anything about their Creators, Altair is not nescient about such information. Rather she is completely au fait about her own existence, about the real world, as well as her creator, Setsuna Shimazaki, who Altair had strong love towards. When Setsuna's suicide occurred, Altair shows great hatred towards the real world to the point where she wants to destroy it.