I have no clue i like some of the variations of it

I've noticed a pattern, that in alot of cases, the base character will end up in the item shop, like the basic dragon does, while the extra costumes may or may not end up in the higher tier of the item shop. Like the pink dragon has shown in the item shop as a higher tier item. But not all dragons have shown up. So its possible the regular panda will, but not the orient costume panda,