>>607335971. The signs which are seen on the trolls' shirt are the zodiac signs based on their blood color! There are also more troll signs in the Extended Zodiac that can tell you if the assigned troll is a Prospit dreamer or a Derse dreamer and what their ability is.
2. The reason why Karkat's sign is gray because he has mutant blood and he's ashamed of it. Trolls with mutant blood are signless.
3.
There are multiple real life references which were brought into the comic as villains like Guy Fiery, Betty Crocker and the juggalo brothers which I don't remember the name of. Speaking of juggalos, trolls with purple blood are based on them. They even have cults and churches to worship clowns.4. Troll romance is actually not that hard to understand! Matespritship is basically normal human love. Moirallegience can be understood as deep friendship. Kismesissitude is when two trolls really really hate each other and Auspisticism is when two trolls hate each other very much but they have another troll to calm them down or keep them from becoming kismesis.
5. :33 < nepeta loves karkat but she's afraid to say because she thinks people would call her weird!