I have not forgotten my OCs, I just haven't drawn them in a while.
I particularly like drawing Katherine since I usually don't draw in black and white. It opens up interesting opportunities to experiment with light and shading. (plus I don't have to worry about colors)
She's sort of my "Barbie OC." She does every job/role, wears other characters costumes, and generally is fun to draw in a wide variety of situations.