What are the trolls going to do about making more trolls since the orb is long gone. Also are we to assume that Karkat is red for Dave and Black for Vriska? I know Vriska can't handle black or red relationships but is it hinting that Karkat wants one? Also can the human and trolls repopulate together making somewhat of a hybrid or are they too genetically different? Sorry for the large amount of questions

Roxy has the ability to produce the Matriorb with her Void powers, she just needs more practice. Karkat being red for Dave seems very likely but I do not think Karkat is actually black for Vriska. Hussie stated on his formspring that trolls and humans could reproduce via ectobiology like how Doc Scratch was made by merging the paradox slime of a cueball and Lil Cal. Appearify one troll and one human and then merge their paradox slime to create the hybrid. At least I’m assuming that’s how they would do that.