Anderson Silva
Silva changed the UFC when he destroyed Chris Leben in his electrifying debut. Nobody saw the Brazilian coming with his electrifying fighting style. He went on an unprecedented winning streak at middleweight and became the division’s greatest-ever champion (via USA Today).
Then he tainted his legacy in 2017 after he failed a drug test. The Brazilian tested positive for clenbuterol and immediately fans called his reputation into question. It didn’t help that he went on a terrible losing streak after his return. However, he still retains massive support from combat sports aficionados.