Some parrots get a bit nippy after they are weaned and are not handled enough, but most blue crowns stay tame. In other species if we have a hand fed baby that we have for several months and do not interact with every day, sometimes they tend to get a little nippy. However each bird has his or her own personality and this does not always hold true. We purchased a crippled unwanted pet that had been fed and housed properly, but never had any interaction with the family, this bird was not totally tame, but never tried to bite. She is now one of our breeder birds and the proud Mom of our pet Bandito.
Blue crowns make excellent parents.
However ours do tend to get aggressive, when they are mating and rearing young ones. At that time we do not tend to leave hands and fingers longer in cages than absolutely necessary. Your Blue Crown Conure does want a lot of attention from you , like most other pet birds, would like to be out of his cage as often as possible and interact with you. They love to take showers and act goofy. They also can take a button of your shirt in about 5 seconds.