Sakazuki

While he is a strong and capable leader who has done well to consolidate the power and prestige of the Marines, Sakazuki would be best categorized as an extremist and highly dogmatic. He is an adamant believer in Absolute Justice and is ruthless in his maintenance of it, his derived motto being "Thorough Justice". He has a stern, dead-serious disposition, is grim, expressionless, and was the most ruthless out of three admirals pre-timeskip. 

This has given him a very fearsome reputation, but of greater concern is his dogmatism, which may end up making the Marines into a force that is worse than the enemies they hope to eliminate. Despite this disposition, Sakazuki seems to be able to restrain himself at times, having chosen to spare the life of Jewelry Bonney and her crew after they were left beaten and tied by the Blackbeard Pirates for the then-admiral to salvage, and letting his colleague Aokiji leave the Marines after he lost a ten-day duel for the position of fleet admiral.

Abilities and Powers

Leadership and Intelligence

Attesting to Sakazuki's perceived leadership competencies and military acumen, he had many dignitaries of the government strongly push for him to succeed Sengoku as fleet admiral, over the latter's personal nomination of Kuzan. While known, feared, and disdained by some for his hardline, over-the-top methods, Sakazuki's prowess as a leader is undeniable. Indeed, as noted by Jinbe, the Marine HQ under him has grown far stronger and more determined than ever before, despite the resignations of Kuzan, Sengoku, and Garp, thus bearing out Sakazuki's capabilities.

Physical Abilities

As with all admirals, Sakazuki's physical prowess is immense. His raw physical strength was enough for him to go up against and clash evenly with Whitebeard in close quarters—the "Strongest Man in the World" who, in his old age, could still overpower a giant's strength easily. Using a single leg, Sakazuki held back a two-handed swing of the elder's large naginata, which came clad in a quake bubble to massively enhance its power. 

Devil Fruit

Sakazuki ate the Magu Magu no Mi, a Logia-type Devil Fruit that allows him to create, control, and transform his body into magma. His magma is extremely hot and highly explosive,[58][59] thus making it well-suited for combat, allowing Sakazuki to burn, melt, and destroy anything in his path—in fact, among all Devil Fruits, Sakazuki's is said to offer the greatest attack power.

Busoshoku Haki

During the Summit War, Sakazuki was seen using advanced-grade Busoshoku Haki to block and disperse a long-distance quake shockwave sent out by Whitebeard, by generating, with his fellow admirals, an emitted shield combination of their three Haki.

Kenbunshoku Haki

Sakazuki possesses the ability to use Kenbunshoku Haki.