Blue is a transgendered mercenary of an evil crime boss. He/she likes to wear red clothing, in contrary to their name. Like his/her boss, he/she is a ruthless outlaw, who does anything and everything they want, stepping on others without any hesitation. Despite this, it is shown that the boss cares about Blue deeply.
A librarian robot, who produces records of the lost human civilisation related to laughter, setting up the robots' jokes. She acts a bit superior and over-confident.
Angie is Justin's best friend and Corkey's sister, she too is swept up by the mysterious flying house on that faithful day. She is always there for her friends when she is needed, and always plays the mother figure to both of them.
Touwa is Yuka's stepbrother. Yuka thought that he hates her since they were kids.