ok, so what we have here.

Karkat said Black Romance before, so that is probably BlackRom. I’m guessing that is the hate-fucking side.

RedRom (not murder backwards) is the opposite, so that is the romance/love side.

Kismesis is 2 people absolutely hating each other.

Moirail is….one hate and one love? Or unrequited love? Given that Karkat said she was ALL Hate and no one would Pity her (love)

Matesprit would be 2 lovers.

He should really talk to Nepeta about this, she would love it