Born and raised in Burgettstown, Pennsylvania, a small town near Pittsburgh. He is the middle son of Petro and Despina Maropis and is very close to his brothers, Sam and Chris.

Being an exceptional all-around athlete in high school (Burgettstown High-school in southwest Pennsylvania), it appeared Adoni would pursue a professional career in some sport. Turning down various athletic scholarships, he enrolled at West Virginia University and graduated magna cum laude with a Bachelor's Degree in Business Administration. But, from years of being entertained by Adoni's impromptu comedic performances and impersonations which began when he was a small child, his father, Petro, told him that the suit and tie of the business world would probably choke him to death and encouraged Adoni to give acting a shot.