On Terezi's b-day, Karkat asked Kanaya to teach him how to sew so he could make her a scalemate. It's the only one she hasn't hanged or ruined.

Terezi's and Karkat used to have tickle fights before and after Terezi went blind.

When Terezi is bored she'll send Karkat loads of pictures of her with scalemates, especially the red ones.