Could you possibly link it the theory for the bright red meaning damaged please?? And what about Kanaya? Her skirt is bright red and I was wondering, like how Nepeta wears equius' colour, is it like her and Karkat without the moirailleigence? Or?

Sure.  And I doubt Kanaya’s skirt is in reference to Karkat’s blood color since she didn’t know it was red until after they started playing the game.