The wall I want to cover is like a medium dark pink. I'd rather not primer as it's a closet I'm wallpapering. Will it show through the paper?

This is a fairly heavyweight paintable wallpaper, so the pink wall should not show through. Painting the wallpaper once it has been installed will ensure this. If you're uncertain, we recommend testing with a small piece of wallpaper to ensure you get the look you're after.