Muhammad Ali is widely considered the greatest boxer of all time due to his exceptional skills, charisma, and social impact.

Demetrious Johnson holds the record for the most consecutive title defenses in the UFC, with 11 successful defenses of his flyweight championship.

Francis Ngannou is the current UFC heavyweight champion, having won the title in March 2021.

Mike Tyson is known for his devastating knockout power and is nicknamed "The Iron Mike" due to his aggressive fighting style and ability to knock out opponents with a single punch.

Floyd Mayweather Jr. is the only fighter to win world championships in five different weight classes, from super featherweight to light middleweight.

Anderson Silva is known for his exceptional grappling skills and is nicknamed "The Spider" due to his ability to control opponents on the ground and submit them with various techniques.

Amanda Nunes is the current UFC women's bantamweight champion, having won the title in July 2016.

Sugar Ray Robinson is known for his exceptional footwork and is nicknamed "The Sweet Science" due to his ability to move gracefully in the ring and evade punches while delivering his own.

Georges St-Pierre is the only fighter to win the UFC lightweight, welterweight, and middleweight championships.

Conor McGregor is known for his exceptional striking skills and is nicknamed "The Notorious" due to his outspoken personality and ability to generate hype for his fights.

Deiveson Figueiredo is the current UFC flyweight champion, having won the title in July 2020.

Tommy Hearns is known for his exceptional defensive skills and is nicknamed "The Hitman" due to his ability to avoid punches and land his own with precision.

Conor McGregor is the only fighter to win the UFC featherweight and lightweight championships simultaneously.

Khabib Nurmagomedov is known for his exceptional wrestling skills and is nicknamed "The Eagle" due to his ability to dominate opponents on the ground and submit them with ease.

Kamaru Usman is the current UFC welterweight champion, having won the title in March 2019.