Aljamain Sterling: ESFP
Aljamain Sterling is the current bantamweight champion. Inside the octagon, he is known for his wrestling acumen and Brazilian jiu-jitsu skills, which he often uses to secure quick back takes en route to his patented rear naked choke.
Outside the cage, Sterling is best identified by his flashy fashion sense. He puts enormous importance on his aesthetic, from his distinct hairstyles to the large signature gold chain he wears outside the octagon. This trait is common among ESFPs who pride themselves on their fashion choices.
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The world champion is also as generous as most ESFPS, even offering to move to the featherweight division to give his teammate Merab Dvalishvili an opportunity to capture bantamweight gold.
Alexander Volkanovski: ISTP
The reigning featherweight kingpin is a well-rounded fighter who uses his multi-faceted skill-set to cause his foes to undergo a decision-overload. This is in line with the behavior of the ISTP.
To cause an overload of decisions in his foes, Volkanovski achieved significant skill in every facet of mixed martial arts, operating with a degree of freedom that rendered him just as likely to pursue striking as much as he did wrestling. The unpredictability of his approach matches the unpredictable nature of the ISTP.
Volkanovski further exhibited this trait when he, for his own reasons, directed trash talk at three-time opponent Max Holloway when the latter was forced to withdraw from a bout due to injury. Until then, the Australian had never been known to engage in such behavior.
Charles Oliveira: ESFP
Unofficially, Charles Oliveira is the lightweight champion. He never lost the championship in the octagon, instead relinquishing it due to a mishap at the weigh-ins before defeating title challenger Justin Gaethje in a definitive fashion.
Oliveira seems like an ESFP; an entertainer, if there ever was one. In the cage, he is an exciting action fighter who, like the ESFP, enjoys putting on a show. He is also willing to step outside his comfort zone, as evidenced by his adoption of Muay Thai over simply clinging to his comfort zone of Brazilian jiu-jitsu.
Furthermore, Oliveira also possesses the bold nature of the ESFP, even going so far as to claim he'd face Islam Makhachev and then challenge Khabib Nurmagomedov to abandon his retirement. Lastly, the Brazilian exhibits a distinct aesthetic with his dyed blonde hair, indoor sunglasses, and vibrant suits.
Kamaru Usman: ISFP
The only MMA fighter who currently poses a challenge to Alexander Volkanovski as the pound-for-pound best fighter in the world, Kamaru Usman is one of the most dominant fighters in the sport today. The welterweight champion exhibits the traits of an ISFP.
While naturally introverted, he is eager to expand his boundaries and try his hand at new projects. This is best seen in his growing passion for boxing. Usman, a lifelong wrestler, developed a sharp jab under the tutelage of Trevor Wittman. Yet, even the octagon couldn't contain his desire to expand. He repeatedly challenged Canelo Alvarez to a boxing match before recently swearing to jump up to the light heavyweight division.
This is not only in line with the adventuristic traits of the ISFP but also their independent streaks. Furthermore, Usman is overly competitive and is often bothered by minor slights that he perceives as a challenge.