On this page he said he was mind-controlled by Vriska to troll her. 

“Being from Derse means you are from a culture of offense and aggression. Being from Prospit means the opposite. You could argue that these are qualities that either rub off on the dreamers, or they are designated as those dreamers in the first place because of those qualities. You could take the view that these are innate tendencies to overcome, as seemed to be the case for Jade and Rose. Or maybe sometimes they are tendencies that are resisted, and need to be understood and embraced. As a Prospit dreamer, did Karkat struggle because he was actually passive in nature, but had a very active self image as a leader and conqueror? Was Vriska an even more extreme case of misplaced active behavior from a Prospit dreamer? These are yet more things to consider when looking at everything contributing to the hero story of an individual in this game.” - Source.

Yes.

Nope, they are just called cats

They aren’t seen as something erotic, they’re seen more as indecent. 

Hold on, that fact is wrong. She’s saying she read about assassinations not committed any. Am fixing now.

She does not have rainbow drinker abilities

I’m not sure but I want to say yes since at that point they are literally just a ghost

a 48 player squiddles session was a joke that Hussie made to explain the Trolls having a 48 sign horoscope

She died