The most feared UFC fighter is probably Conor McGregor. He is a former UFC Lightweight Champion, former UFC Featherweight Champion, and a former Cage Warriors Featherweight and Lightweight Champion. McGregor has established himself as one of the UFC’s most dominant and feared fighters by going undefeated in his first ten fights in the UFC. Additionally, he has some of the most impressive knockouts in the organization’s history. His fearlessness, power, and charisma make him one of the most recognizable fighters in the sport.