Arlong

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Arlong the Saw is a sawshark fishman. He served as the pirate captain of the all-fishman crew, the Arlong Pirates, was a former member of the Sun Pirates, and is the older brother of Madam Shyarly. He is recognized as the primary antagonist of the Arlong Arc and held the highest bounty in the East Blue prior to his defeat by Monkey D. Luffy.
Like numerous other One Piece characters, he possesses a distinct laugh, which is "Shahahahaha".
Arlong regards humans as inferior beings and treats them with extreme cruelty. He is eager to separate his race from humans and remains firmly convinced by the mentality that his people are superior in every aspect. He shows no hesitation in killing an entire town of humans, although he appears to prefer controlling people through money and agreements (such as with Nami and Nezumi).
He has a knack for identifying exploitable talent that he can utilize for his objectives and is a skilled planner. He spent eight years using Nami and her maps to scheme his takeover of the East Blue. Nevertheless, he honors any promise regarding money that he makes. The prime example occurred when his crew urged him to retain Nami even if she brought the 100,000,000 Beli. However, although Arlong claims he cannot go back on his word, he has no reservations about exploiting loopholes in his deals to unfairly achieve his aims.
He is quite prone to anger, going berserk after being attacked by Usopp and needing to be dragged back to his base by his crew to stop him from destroying the entire town. During his battle with Luffy, the boy's persistent resistance enraged Arlong, driving him into a deep fury. Arlong had anticipated Luffy would die quickly, but his anger caused him to become reckless and destructive, even severely damaging his own headquarters while attacking Luffy.
He has been ill-tempered since his youth. However, he was not always entirely brutal. During a battle with the Marines, Arlong instructed Jinbe to leave the unconscious Marines alone. It was later revealed that he had grown more arrogant over time, reaching a point where he completely lacked sympathy for humans. Tiger's death caused his hatred to hit rock bottom. He also failed to comprehend Fisher Tiger's reason for sparing the humans they had attacked. Consequently, when Arlong led his own crew and committed murder, humans came to view him as a "monster". He was loathed for the actions of himself and his crew. Ultimately, he enslaved humans just as humans had once enslaved many fishmen.
Although his opinions and ideals were extreme, he demonstrated a high level of brotherhood with his crew and even toward Nami, despite the species divide. Arlong looked after his crew members, and although he betrayed Nami, he did so because he did not want to lose her talent. Furthermore, in the final moments of the battle with Luffy, he stated that Nami was his crew member and would remain so forever; while he never showed any regard for her as a friend, he was prepared to fight to keep her in the crew. If humans insulted their group, Arlong would react to the insult, and due to the high level of concern among his officers, they would attempt to keep his temper under control. When weaker members of his crew were injured, Arlong would seek revenge on those who had committed the act against those crew members.
Ironically, Arlong is a hypocrite, having accused Koala of being raised to look down on fishmen and consider humans superior to everyone else, when Arlong himself looked down on humans and preached fishman superiority, making him no better than the humans. Surprisingly, despite his hatred of humanity, according to Hatchan, Arlong would never harm his fellow fishmen under any circumstances. He cared for his crew to such an extent that when Luffy used one of them as a shield, Arlong became extremely angry.