An unused placeholder character can be found in the coding of the arcade version of Continuum Shift 1. The character is named "Tubaki Yayoi" ("Tubaki" being a misromanization of "Tsubaki" as in "Tsubaki Yayoi", an actual character), her character select nametag is still written in the Calamity Trigger font and her main portrait is that of Nu's CT artwork with the head of Noel Vermillion's story portrait pasted on it.

In game her sprite is a static image of Nu/Lambda with "MU" written on it, meaning that Tubaki is aplaceholder for the character Mu-12, an alternate version of Noel.