karkat's "o:B" emoji is either an angel or a devil

(in reference to the significance of the letters O and B)

good point! this is actually alluded to directly in the text of the comic:

GG: is that supposed to be someone with a halo and goofy teeth?
GG: ARE YOU MAKING FUN OF ME?
CG: NO, NO
CG: YOU’RE LOOKING AT IT BACKWARDS
CG: THOSE ARE MY HORNS

this connects directly to karkat’s sign, which is also a version of the B/O symbol that represents a demon and an angel stacked against each other.

possibly worth noting that “halo” is a term occasionally used in astrophysics regarding black holes, which the letter O is also connected to.