THE EXTENDED SIGN LIST MEANS THAT IN BLOODSWAPS, UNLESS THE BLOODSWAPS ALSO EXCHANGE ASPECT + LUNAR SWAY, THE SWAPPED TROLLS WOULD HAVE DIFFERENT SIGNS.
karkat’s fuschia now?! BOOM
(all jokes aside I’m sure other people have pointed this out and I ain’t gonna tell anyone how to do their AUs, this is just a realization that struck me out of the blue and I got very weirded out about it. “sign of the confidante” seems to fit him pretty well though!)