So I’m sure you all know, or at least plenty of you have known and theorize that Karkat is a limeblood with a mutation. If you haven’t, let me do a quick recap. Karkat is a mutant cherry red blood, yet his sign is right between Sollux and Nepeta’s, where the extinct troll blood color Lime would reside. That, along with this ( http://www.mspaintadventures.com/?s=6&p=005986 ) page, along with a few of the following ones, where Karkat is ‘shooshing’ Gamzee in lime green text, have lead people to believe that Karkat wasn’t supposed to be a mutant blood, but a lime blood.
Now that that’s out of the way, let me tell you why that’s bullshit. First, let’s start with why wasn’t Karkat was ‘supposed’ to be a lime blood. When John used the ectobiology chamber, he made perfect ectoclones of him, his friends, and the alpha kids. Because they were perfect ectoclones, meaning everything in their DNA is exactly the same (no mutation, no personality differences that could occur later in life, no nothing), they were transported to their respective meteors to be hurtled at the Earth on the day they were ‘born’. From this, we know that, in every aspect, Karkat and Kankri couldn’t have been anything except candy red bloods. If they had had the smallest deviation from their current selves, they wouldn’t have been sent to their meteors. The imperfect grubs could’ve been made into grubsauce (or given to Eridan to kill the landwellers) and the universe wouldn’t have cared. Because they need to be the ‘mutants’.
Now you’re probably questioning why Karkat’s sign is between Sollux and Nepeta’s then, instead of before Aradia’s. Well that’s just it, it’s Karkat’s sign, not Karkat and the Signless’s sign. The Signless, as his name would imply, had no sign. Karkat only has a sign because the Signless’s followers took the shackles that Signless was bound by during his death and created the sign, along with breading Crabdad to be a candy red blood lusus, so that Karkat wouldn’t have to go through the terror that not having a sign or a lusus could cause.
So, here comes my theory. What if Karkat’s sign replaced a lime blood sign? None of the trolls show any sign of not knowing that Karkat’s sign wasn’t part of the original 48 in the troll zodiac, including Karkat himself. If he was able to hide it for so long, I would think it was because it replaced a sign instead of being added, or the other trolls would know immediately that that sign is the ‘false sign’, what I just now decided to call a sign that didn’t belong in the first place, and know his blood color. If the Signless’s followers were to replace an existing sign from any of the non-extinct blood castes, the trolls in those castes would surely cause some kind of commotion. The only choice would be to replace a lime blood sign, the only caste that is extinct.
And no, I don’t know how to explain the lime green text. Hussie might be throwing us a false trail. He seems to love doing that. Anyway, thank you all for reading and have a nice day!