I don't really know...
Princess Ruby variant with Chumster, hat, comb, ribbon and wand? Complete Berrytown family with combs, ribbons and backcards? The Seven characters with combs, ribbons and back cards? Baby Ruby with bracelet and ring and Baby Diamond? Baby Lemondrop and her carriage? Lightning? Fireball? Baby Lucky? Baby Mischief? Pink Dreams complete with wings?
I'll be honest I don't know which ones are particularly rare in my herd and most of that *points up* is mere guess work. I work on the idea of, "which ones don't I see a lot?"
If they're from childhood most are mint or near mint but complete with accessories as well, if not then same but without accessories (usually).
I don't know how rare the Mummy Charms or Petite Ponies are either...