Big Hero 6 Mystery Set

Does anyone know any tips/tricks to completing this set, and avoiding Fred at all costs?!? Been working on this set for a couple months now and can’t seem to complete it, every time I get a box it’s duplicates, and it seems like the yellow added pin is in every single one🤦‍♀️ ISO-Hiro, Baymax, Wasabi, and Honey Lemon all without super hero attire on.