Can you imagine how it would feel to live your whole life in a prison, to be called a vicious monster, to receive no love and no affection from your own family, to be forced to kill innocent people and to end up being killed with the help of your sister? The Minotaur not only can picture but most importantly knows exactly how all these scenarios feel as he had lived through them.
Theseus killed him, making the Minotaur a unique creature as there is no other being like him in mythology or in real life. A tribute to this ill-treated being is paid by creating a happy and carefree version of the Minotaur with a gold heart and a free spirit so that he can finally enjoy life in new terms, with no rules and no restraints.