A pair of twin assassins who always work together as one Noh agent unit, they are often sent on missions that require their unique synchronicity. Born conjoined at the arm, they each have a prosthetic replacement, other than this very little is known of their background. One sister (the left twin) is quite talkative and taunts her targets, whereas the other is more taciturn and chooses to talk only when situations require. Kabuki Volume 4: Skin Deep sees Siamese standing over Ukiko's corpse, presumably having killed her. With the entirety of the next two volumes acting as a flashback, Siamese take on a darkly, sinister tone, appearing briefly, but always after an act of brutal violence – the build-up to their confrontation is slow and full of dread. Ironically the quiet right twin of the two is revealed to be a fan of Kabuki's on-screen persona and despairs over their mission. Siamese's Noh costumes are sleeveless T-shirts bearing the Japanese sun and rotations of stockings and trousers. The prosthetic arms act as weapons by being fitted with various attachments, and their masks are halved and monochromatic.